Christianity

Christianity is a Abrahamic monotheistic world religion which is based on the life and teachings of Jesus, his crucifixion and death, and his resurrection, and on his apostles, disciples, and followers. 

Many Christian churches, branches, and denominations believe and teach that Jesus was the messiah (Christ) and the Son of God – the Logos incarnation – who was sent by God, his father, to preach and teach the Gospel (the Good News) to the world and his followers, was arrested and executed by crucifixion on Good Friday for the sins and wrongdoings of humanity, physically resurrected from the dead three days later on Easter Sunday for the salvation of humanity and went to heaven to God, his father, and is in his kingdom, sitting on his right hand.

Many Christian churches, branches, and denominations also believe and teach in his Second Coming, the belief that Jesus will one day return to the world, to judge people, and in the Trinity which teaches that there are three distinct persons in One God (i.e. God the Father, God (i.e. Jesus) the Son, and the Holy Spirit). Many Christians also pray using the trinity.

Christianity is the world's largest and most widespread religion, and is followed by over 2.38 billion people worldwide, comprising around 28.8% of the entire world population. It's members and adherents known as Christians are estimated to make up a majority of the population in 157 countries, states, and territories worldwide. Christianity is culturally diverse in its Western Christian and Eastern Christian branches and churches, and also doctrinally diverse concerning justification and the nature of salvation and its attainment, ecclesiology, ordination, Christology (study of Christ), and Mariology (study of Mary, mother of Christ).

The four canconical gospels of Matthew, Mark, Luke, and John – who are four of the twelve apostles of Jesus – are found in the New Testament of the Bible, and describe the life, ministry, and teachings of Jesus, as preserved in early Christianity, with the Old Testament of the Bible serving as the gospel's respected background for the coming of the messiah Jesus and his teachings.

Christianity started as a minor religious sect of ancient Second Temple Judaism – with Hellenistic influences – founded in Judea around 30 AD, by Jesus and his followers, and developed and became a minor religion by the 2nd century AD, after Jesus's apostles, disciples, and followers spread the gospel and teachings of Jesus throughout the Roman Empire and later in areas outside the Roman Empire (such as in the  Sassanian Empire, Britain, Kingdom of Armenia, India, Ethiopia and other kingdoms and areas), and converted many people to Christianity, despite the severe persecution, mass killings, and genocide of Christians for their faith and belief in Jesus by the Romans and others.

Christianity became separated from the religion Judaism in the 2nd century AD and became it's own religion when many of the Gentiles who converted to Christianity refused to use or recognize any Jewish practices, beliefs, and customs. Although Christianity was illegal and strictly forbidden in the Roman Empire and in some other kingdoms such as India, the religion continued to grow and attract more followers from different areas – both inside and outside of the Roman Empire – despite many of the followers being severely persecuted by torture, mutilation, dismemberment, and murder horribly in the genocide against Christians in the Roman Empire.

The torture and killings of Christians continued in the Roman Empire until the 4th century AD. Even though the Roman Emperor Constantine I, together with his co-emperor Licinius I, legalized Christianity by issuing the Edict of Milan in 313 AD, and banned Christians (and others from persecuted groups) from being tortured, mutilated, dismembered, and killed for their faith, and the Emperor Constantine himself converted to Christianity and followed Jesus, a lot of Christians in several provinces of the Eastern Roman Empire continued to be tortured and killed in the genocide until around 325 AD or so, especially by Roman authorities and soldiers, despite the tortures and killings being illegal and strictly forbidden. When the tortures and killings of Christians ended alltogether and the genocide stopped all together in almost all areas of the Roman Empire around 325 AD, with Emperor Constantine making the penalty for the crime of torturing and killings of Christians (or anybody else from a previously persecuted group) much harsher and enforcing the law harder, stating that all groups of people deserve to live unmolested and unpersecuted in peace.

In the year, 325 AD, the First Council of Nicaea was convened in Niceaea and Christian bishops and priests from all over the Roman Empire came to meet and talk about the theology of Christianity. The priests and bishops wrote rules and theology of Christianity and the christology of Jesus that was agreed and decided on in the Nicene Creed and aldo adopted the Trinity (the idea of three distinct persons in One God] which was followed by mainstream Nicene Christianity. Most Christian churches, branches, and denominations who rejected the Trinity and the Nicene Creed followed Gnosticism, and became Gnostic denominations such as the Arians and Donatists for exmaple.

Christianity was then consolidated in the Roman Empire and Emperor Theodosius I made Christianity the official state of religion of the Roman Empire in 381 AD, with the First Council of Constantinople. Nestorianism and the Oriental Orthodox churches both split into different Christian denominations and churches due to differences in their own theology and Christology in the 5th century AD, after the Council of Ephesus and the Council of Chalcedon, while the Catholic Church and Eastern Orthodoxy split in the Great Schism of 1054, with Eastern Orthodoxy being predominant in Eastern European and some Levantine countries and cultures and the Catholic Church being predominant in Western countries and cultures, while Protestantism split from the Catholic Church, during the Reformation Era in the 16th century, and split into numerous denominations, branches, and churches, while Restorationism split from Protestantism, when certain new sects, denominations, and churches with new beliefs and theology emerged, especially throughout the 19th and the 20th centuries such as the Mormon Church of Jesus Christ of Latter-day Saints and the Jehovah's Witnesses, and believed that the original teachings, practices, and beliefs of Jesus and his apostles, disciples, and followers were lost and/or misinterpreted, and required a restoration, while non-denominational Christianity is a term used to refer to people, groups, and churches of Christianity that do not belong to any denomination and are therefore independent and unaffiliated with any Christian denomination.

During the early Middle Ages, Europe underwent a large Christianization process, with many cultures, tribes, and kingdoms being converted to Christianity. Christianity expanded worldwide due to missionary work, evangelism, colonization, immigration, and extensive trade, and split into numerous denominations, branches, and churches with their own theology, due to differences and reformations in theology and Christology.

Christianity, especially the Catholic Church, played a extremely prominent role in the development of Western civilization during the Middle Ages, and has heavily influenced Western art and culture.

Prominent denominations, branches, and churches of Christianity include Catholicism (around 1.2 billion followers), Protestantism (around 1.1 billion followers), Eastern Orthodoxy (around 230 million followers), non-denominational Christianity (around 80 million followers), Oriental Orthodoxy (around 67 million followers), Restorationism (around 52.3 million followers), and Nestorianism (around 398,400 to 443,000 followers). 
 Jesus Christ 

The most basic part of Christianity is the belief in Jesus as the Son of God and Messiah (Christ). The title "Messiah" comes from the Hebrew word  (māšiáħ) meaning anointed one. The Greek translation Χριστός (Christos) is the source of the English word "Christ". Jesus is English for the Hebrew word Yeshua. 

Christians believe that, as the Messiah, Jesus was anointed by God as ruler and savior of all people. Christians also believe that Jesus' coming was the fulfillment of prophecies of the Old Testament. The Christian belief of the Messiah is much different than the contemporary Jewish concept. The main Christian belief is that, through the death and resurrection of Jesus, sinful humans can be reconciled to God. Through this, they believe they are given salvation and eternal life.Metzger/Coogan, Oxford Companion to the Bible, p. 513, 649.

There have been many theological disagreements over the nature of Jesus over the first centuries of Christian history. But Christians generally believe that Jesus is God incarnate and "true God and true man." Jesus, having become fully human, suffered the pain and temptations of a mortal man, but he did not sin. As fully God, he defeated death and came back to life again. According to the Bible, "God raised him from the dead,", , , , , , , , , , , , , , , , , , , , ,  he ascended to heaven, is "seated at the right hand of the Father"The Nicene Creed and will return again to fulfill the rest of Messianic prophecy such as the Resurrection of the Dead, the Last Judgment, and the final creation of the Kingdom of God.

The Gospels of Matthew and Luke say that Jesus was conceived by the Holy Spirit and born from the Virgin Mary. Only a little of Jesus' childhood is written in the canonical gospels, but infancy gospels were popular in antiquity. However, the time of Jesus' adulthood the week before his death is written much about in the gospels. Some of the Biblical writings of Jesus' ministry are: his baptism, miracles, preaching, teaching, and deeds.

 Death and resurrection of Jesus 
Christians believe the resurrection of Jesus to be the main part of their faith (see 1 Corinthians 15) and the most important event in human history because it would show that Jesus has power over death and has the authority to give people eternal life., , , , , , and .Hanegraaff. Resurrection: The Capstone in the Arch of Christianity. thumb|right|160px|Jesus helped by Simon of Cyrene, 19th century Brazilian depiction
Among Christian beliefs, the death and resurrection of Jesus are two main events of Christian doctrine and theology. From what the New Testament says, Jesus was crucified, died a physical death, was buried in a tomb, and rose from the dead on the third day afterwards., ,  Most Christians place his death on a Friday each year, which is the first day of his death. Saturday is the second day, and Sunday is the third day. The New Testament writes that after rising from the dead Jesus appeared many times before his Twelve Apostles and disciples.  Once He appeared before "more than five hundred brethren at once". This was before Jesus' Ascension to heaven. Jesus' death and resurrection are remembered by Christians in their worship services, and most commonly during Holy Week, which has Good Friday and Easter Sunday in the week. The date for Holy Week changes from year to year as it is partially based on the Jewish lunar calendar. 

Salvation of Christ

Protestantism teaches that eternal salvation is a gift that is given to a person by God's grace. It is sometimes called "unmerited favor." This would mean that Salvation is God bringing humans into a right relationship with God through faith in Jesus Christ. It is the belief that one can be saved (rescued) from sin and the eternal death of hell. Many Protestants believe in the "assurance of salvation"—that God can put confidence in a believer that he has truly received salvation from Jesus Christ.

Catholicism teaches that although in most cases someone must be baptized a Catholic to be saved,CCC 846; Vatican II, Lumen Gentium 14 it is sometimes possible for people who have not fully joined the Catholic Church to be saved. Catholics normally believe in the importance of "faith working through love" and sacraments in receiving salvation. The Catholic Church teaches that good works and piety, such as obedience to commands, taking the sacraments, going to church, doing penance giving alms, saying prayers, and other things, are important in becoming holy, but strongly emphasize that salvation is through God's grace alone, and all we can do is receive it.

Different denominations and traditions of Christianity believe in forms divine grace. Roman Catholicism and Eastern Orthodoxy teach the complete importance of the free will to work together with grace. Reformed theology teaches the importance of grace by teaching that a person is completely incapable of self-redemption, but the grace of God overcomes even the unwilling heart. Arminianism believes in a synergistic view, while Lutheran and most other Protestant denominations teach justification by grace through faith alone.

 Scriptures 

Christianity uses the Bible, a collection of many canonical books in two parts, the Old Testament and the New Testament. It is believed by Christians that they were written by people who were inspired by the Holy Spirit, and therefore it is most often believed to be the word of God. The Bible has been translated into over 600 languages. The translators are able to verify accuracy by using thousands of handwritten copies of the scriptures which are in the original languages of Hebrew Aramaic, and Greek.

 Creeds 

Creeds (from Latin credo meaning "I believe") are direct doctrinal statements or confessions, usually of religious beliefs. They started as formulas used when someone was baptised. During the Christological controversies of the 4th and 5th centuries they became statements of faith.

Some main Christian creeds are:

 The Apostles' Creed (Symbolum Apostolorum)
 The Nicene Creed

Many Christians accept the use of creeds, and often use at least one of the creeds given above. A smaller number of Protestants, notably Restorationists, a movement formed in the wake of the Second Great Awakening in the 19th century of the 19th century United States, oppose the use of creeds.

 Trinitarianism 
The Bible mentions God the Father, God the Son, and the Holy Spirit, which are three persons of the one True God. This idea, called Trinity, was developed at the First Council of Nicaea, in 325, and formalized during several church meetings or councils. Currently, many Christian churches are trinitarian.  The Oriental Orthodox Churches agree with the ideas in the First Council of Nicaea, but they disagree with other councils.

Trinitarianism is the teaching that God is three different persons, or has three different relations, within One God; the Father, the Son (Jesus Christ), and the Holy Spirit. In the words of the Athanasian Creed, "the Father is God, the Son is God, and the Holy Spirit is God, and yet there are not three Gods but one God."Kelly. The Athanasian Creed.thumb|right|Sculptural group from the Holy Trinity Column in Olomouc, Czech Republic, 18th century
Trinitarianism is the group of Christians who believe in the doctrine of Trinity. Today, most Christian denominations and Churches believe this. Churches have different teachings about the trinitarian formula. Some say the Spirit comes only from the Father. Others say the Spirit comes both from the Father and the Son. This is known as filioque. Nontrinitarianism (also called Oneness) is the beliefs systems that reject the Trinity. Many different Nontrinitarian views, such as adoptionism or modalism, existed in early Christianity but were refuted by the majority of Christians, leading to the disputes about Christology.

An example of a more recent movement that claims the title of Christian but rejects trinitarianism is the Church of Jesus Christ of Latter-day Saints. The Latter-Day Saints started in the first half of the 19th century, in the United States. There are other smaller groups who also reject trinitarianism.

 The afterlife and end times 
Christians  believe that human beings will receive judgement from God and are given either eternal life or eternal damnation. This includes the "Last Judgment" as well as the belief of a judgement particular to the soul after death.

There are also some differences among Christians in this belief. For example, in Roman Catholicism, those who die in a state of grace, go into purgatory, where they are cleansed before they can go into heaven.

Christians believe that at the second coming of Christ at the end of time, all who have died will be raised up from the dead for the Last Judgment, when Jesus will establish the Kingdom of God. There is also the belief of Universal Reconciliation. That is the belief that all people will someday be saved, and that hell is not forever.Farrar. Mercy and Judgment , p. 378-382. Christians who believe in this view are known as Universalists.

Christians have different ways to talk about the purpose of Jesus' coming: 
 to learn the best way to live and to follow his example
 to pay the price of sin in our lives by being the perfect sacrifice, without sin. (John 3:16)
 to tell people that their mistakes and sins will be forgiven and will be saved if they believe and have faith in the Lord Jesus and confess that they have sinned (1 John 1:9) (John 3:16) (Ephesians 1:7) (Romans 10:9)
 to display to people his immense power and why they should fear him.
 to teach people to forgive each other and repent of their own sin through grace. (Matthew 6:14)
 to "destroy the devil's work" (1 John 3 v 8)
 to help people share in his life through the gift of God's Spirit."For all have done wrong and are far from the glory of God; And they may have righteousness put to their credit, freely, by his grace, through the salvation which is in Christ Jesus: Whom God has put forward as the sign of his mercy." Romans 3:23ff

 Worship 
Worship is thought by most Christians to be a very important part of Christianity all through its history. Many Christian theologians have called humanity homo adorans, which means "worshiping ," and so the worship of God is at the very center of what it means to be human. This would mean that because God created all humanity, Christians should worship and give praise to God.right|thumb|200px|Monument honoring the right to worship, Washington, D.C.
Most Christian worship has Scripture reading, talk about Scripture from a leader, singing, prayer together, and a small time for Church work. Christians may meet in special buildings, also called Churches, or outdoors, or at schools, or anywhere Christians feel they are needed.

The main worship service in Catholic Churches is the Mass and the main worship service in many Orthodox Churches is called the Divine Liturgy. In both of these Churches, along with the other parts of worship, the Eucharist or Communion is central. Here a priest by prayer asks God to change a small amount of bread and wine into what Catholics and Orthodox believe is Jesus's real body and blood, but without changing the accidents (appearance, taste, colour, etc.) of the bread and wine. Then the people each may receive a portion. Many Protestant churches have worship services similar to the Mass, some every week, others a few times a year. Some Protestants believe Jesus is really present at the Communion service, and some believe the bread and wine are symbols to help them remember what Jesus did

The Catholic Church has developed a short ceremony, Eucharistic Benediction, worshiping Jesus present in the Eucharist. They also may visit a Church building to pray in the presence of the Eucharist, Eucharistic Adoration.

The Orthodox and Catholic Churches spirituality place importance on the use of human senses such as sight and on the use of beautiful things. Catholic spirituality often involves the use of statues and other artistic representations, candles, incense, and other physical items as reminders or aids to prayer. The Orthodox Churches also use candles, incense, bells, and icons, but not statues. Orthodox and Catholic worship also makes use of movements, such as the Sign of the Cross, made by each person touching first the forehead, then chest, one shoulder, then the other shoulder. There is also bowing, kneeling, and prostration in Catholic and Orthodox worship.

 Sacraments 
In Catholic belief and practice, a sacrament is a religious symbol or often a rite which shows divine grace, blessing, or sanctity for the Christian who receives it. Examples of sacraments are Baptism and the Mass."  The word is taken from the Latin word sacramentum, which was used to translate the Greek word for mystery.left|thumb|200px|The Eucharist
The two most regularly used sacraments are Baptism and Eucharist (communion). Most Catholics use seven Sacraments: Baptism, the ritual immersion of a candidate to welcome them into the church; Confirmation, the sealing of the Covenant; the Eucharist, a ritual where consecrated bread (discs of unleavened, toasted bread) and wine representing Jesus' body and blood are consumed; Holy Orders, Reconciliation of a Penitent (confession), Anointing of the Sick, and Marriage. Some Christian denominations prefer to call them ordinances. These are the Orders from Christ to all believers found in the New Testament.

 Liturgical calendar 

Roman Catholics, Anglicans, Eastern Christians, and traditional Protestant groups center their worship around a liturgical calendar. Some events that are part of this calendar are the "holy days", such as solemnities which honor an event in the life of Jesus or the saints, times of fasting such as Lent, and other events, such as memoria. Christian groups that do not follow a liturgical tradition often keep some celebrations, such as Christmas, Easter,and Pentecost. A few churches do not use a liturgical calendar.Hickman. Handbook of the Christian Year.

 Symbols 
These are some symbols that some denominations or individual churches may use:
 Alpha and Omega - The Greek letters Alpha and Omega are the first and last letters of the Greek alphabet. Alpha and Omega is a reference to God, who calls himself the "Alpha and Omega" (the first and the last letter of the Greek alphabet) in the Book of Revelation.
 Chi - The Greek letter Chi is the first letter of 'Christ' ( "Christos").
 Chi Rho - The Greek letters Chi and Rho are the first two letters of 'Christ' in Greek: Christos. Usually, the long stem of Rho (ρ) runs up and down through the cross of the Chi (χ).
 Christian cross - The cross is the most common symbol of Christianity. Christians believe that their savior Jesus Christ was crucified by the Romans. The cross is important because Jesus died as a sacrifice for the sins of believers. It represents God's love for humanity.
 Crucifix - The crucifix is a cross with the body of Jesus still hanging on it. It is a more popular symbol with Catholics and Eastern Orthodox. It has the same meaning as the cross.
 Dove - The dove is a bird and a symbol of the Holy Spirit. When Jesus was baptized, the Holy Spirit came to him in the form of a dove and rested on him.
 Ichthys - In Greek, the word ichthys /iktheews/ means 'fish', and forms an acronym, "Ίησοῦς Χριστός, Θεοῦ Υἱός, Σωτήρ", meaning "Jesus Christ, God's Son, Saviour" in Greek.
 Lamb - A lamb may be a symbol of Jesus himself, portrayed as the sacrifice for humans.
 Shepherd - A shepherd is also a symbol of Jesus himself and is used in the earliest Christian art. In the Bible, Jesus calls himself the good shepherd who cares for his sheep.
 INRI - INRI is an acronym in Latin "Iēsus Nazarēnus, Rēx Iūdaeōrum" meaning "Jesus the Nazarene, King of the Jews." This is the message that was put on the cross as being the crime for which he was being punished. Christians now use it as a symbol that Jesus is the Messiah, or King of all kings.
 Interlocking rings - Three interlocking rings are a symbol of the Trinity. Each ring is a complete circle, representing each complete person of the Trinity. But each ring is locked with the other two rings, showing that each divine person cannot be separated from the Trinity.

 History 

Christianity has had a large history from the time of Jesus and his apostles to the present time. Christianity began in the 1st century AD as a Jewish sect but quickly spread throughout the Greco-Roman world. Although it was originally persecuted under the Roman Empire, it later became the state religion. In the Middle Ages it spread into Northern Europe and Russia. During the Age of Exploration, Christianity expanded throughout the world, and is now the largest religion of the world.

The religion had schisms and theological disputes that had as result ten main branches or groupings: Catholicism, Eastern Orthodoxy, the Church of the East (Nestorianism), Oriental Orthodoxy (Miaphysitism), Lutheranism, the Reformed churches (Calvinism), Anglicanism, Anabaptism, Evangelicalism—these last five often grouped and labeled as Protestant—and Nontrinitarianism.

 Types of Christianity 

People who call themselves Christians may show or live their faith in different ways. They may also believe different things. Through history, the six main groups or "denominations" of Christianity have been:

 Catholic
 Protestant (including Anglican, Lutheran, Reformed, Anabaptist, Evangelical)
 Eastern Orthodox
 Oriental Orthodox (Miaphysite)
 Church of the East (Nestorian)
 Nontrinitarian (including Jehovah's Witnesses, Mormonism)
Not all Christians use these titles. Some believe Christianity is bigger and includes others. Some believe Christianity is smaller and does not include all these churches.S E Ahlstrom said breaking the church into groups or "denominations" was not real, because many churches said they were the only true Christians. Ahlstrom p. 381. For examples, see the Catechism of the Catholic Church §816; Donald Nash, Why the Churches of Christ are not a Denomination ; Wendell Winkler, Christ's Church is not a Denomination ; and David E. Pratt, What does God think about many Christian denominations? right|thumb|200px|Set of pictures for a number of famous Christians from various fields

 Disagreements 
Some of these groups could not agree on certain points about Christian teaching (called “doctrine”) or practice. The first split was in the 5th century after the Church Council of Ephesus. The council agreed Nestorianism was wrong. The Assyrian Church of the East did not agree and split from the rest. The argument was about the nature of Jesus. Should he be regarded as God and human in one combined nature, or in two separate natures? Most of the bishops, following the Pope (the Bishop of Rome), refused to stay in communion with any bishop who would not say "two separate natures". This was also discussed at the Council of Chalcedon, about 20 years later. The Christians who did not agree with the decision of the Council to excommunicate them, became the non-Chalcedonian Orthodox. The largest Non-Chalcedonian Churches are the Coptic Orthodox in Egypt, the Ethiopian Orthodox, the Armenian, and some Lebanese Orthodox Churches. In general, these churches are known as Oriental Orthodox Churches. Recent discussions between the Roman Catholic Pope John Paul II and the Coptic Orthodox Pope Shenouda III concluded that they believe many of the same things after all, even though the Coptic Church does not recognize the Pope of Rome as its leader.

The third split happened in the 11th century. It is called the Great Schism. It was mostly based on the creed being translated incorrectly from Greek into Latin. The disagreements were made worse because the two cultures often did not understand one another. Also, many Crusaders from Western Europe behaved badly. The Christians in Western Europe were led by the Bishop of Rome, known also as the Pope. They are called the Catholic Church. Most Christians in Eastern Europe, Russia, the Middle East and South Asia, and northeast Africa belong to Orthodox, Nestorian, and Miaphysite Christianity, led by the Bishops of other cities or areas.

In the 15th century, the invention of the printing press made it easier for more people to read and study the Bible. This led many thinkers over the years to return to biblical ideas and to break away from the Catholic Church. They started the Protestant Reformation. The most important Protestant leaders were Jan Hus, Martin Luther, and John Calvin. Later some of these groups disagreed amongst themselves so that these denominations split again into smaller groups. The largest Protestant denominations today are within Evangelical, Lutheran, and Reformed Christianity. In England, a similar protest against the Pope, first political and later religious, led to the Church of England which has bishops and officially calls itself Reformed Catholic but is often referred to as Protestant. The Anglican communion of churches includes several churches called "Episcopal" or "Episcopalian" because they have bishops. Some Anglican Churches have a style of worship that is closer to the Protestant services, others worship more like Catholics, but none of them accept the Pope, or are accepted by him. The Anabaptists also arose from disagreements with Lutheran and Reformed Protestants during what is often called the Radical Reformation. The Evangelical churches arose in reaction to what they views as needs for reform within mainstream Protestantism. This can be seen in the rise of non-conformist movements against the Anglican church in Britain and during revivalist movements, prominently in the several Great Awakenings in Britain and North America. Denominations that arose or surged as a result of these Evangelical reform, renewal, and revival movements include Quakers, Baptists, Moravians, Methodists, the Restoration (Stone-Campbell) movement, Adventists, the Holiness movement, Pentecostals, the Fundamentalist movement, the Charismatic movement, Messianic Judaism, among others including many independent and non-denominational churches. In general, some Protestant denominations, especially within Anabaptism and Evangelicalism, differ from the Catholic, Orthodox, Nestorian, and Miaphysite churches in having given up some of the traditional sacraments, having no ordained priesthood, and not having the same fondness for Mary, the mother of Jesus, that the Catholic and Eastern churches have.

 Groups have different ideas on the nature of God.
 Groups have different ideas on the nature and work of the Holy Spirit in a believer's life.
 The pope is the leader of all Catholics. Other churches have leaders similar to the pope. For example, in the Eastern Orthodox Church, these are called Patriarchs. Still other groups let each church decide about things. 
 Some Christians say that women may not become priests or pastors.
 Some Christians say married people may not become priests.
 Some Christians say that priests can forgive sins by giving out the forgiveness of God, others say that only God can do this.
 In modern times, the rise of atheism and scientific challenges to the traditional Christian story of creation have caused some to believe in "Young Earth Creationism", or a literal interpretation of the first chapters of the Bible, and others to argue that those parts of the Bible are not literally true, but more like poetry.
 Most Christians worship on Sunday,  but some believe that Saturday is the true "Sabbath" and should be kept.
 Some Christians believe that baptism must mean going fully under water, others put some water on the head.
 Some Christian groups baptize babies, while Baptists only baptize persons who have chosen for themselves to follow Jesus .

 Demographics 
With an estimated number of Christians being somewhere around 2.2 billion,33.2% of 6.7 billion world population (under the section 'People')  split into around 34,000 different denominations, Christianity is the world's largest religion. The Christian share of the world's population has been around 33% for the last hundred years. This has caused Christianity to spread throughout the world, mainly in Europe and North America.Ustorf. "A missiological postscript", p. 219f. It is still the main religion of Europe, the Americas, the Philippines, and Southern Africa. However it is becoming smaller in some areas, some of them are; Oceania (Australia and New Zealand), Northern Europe (with Great Britain, Scandinavia and other places), France, Germany, the Canadian provinces of Ontario, British Columbia, and Quebec, the Western and Northern parts of the United States, and parts of Asia (especially the Middle East,Barrett/Kurian.World Christian Encyclopedia, p. 139 (Britain), 281 (France), 299 (Germany). South Korea, Taiwan and Macau).

In most countries in the developed world, the number of people going to church who claim to be Christians has been dropping over the last few decades.Putnam, Democracies in Flux: The Evolution of Social Capital in Contemporary Society, p. 408. Some believe that this is only because many no longer use regular membership in places, for example, churches,McGrath, Christianity: An Introduction, p. xvi. while others believe it is because people may be thinking that religion is no longer important.Peter Marber, Money Changes Everything: How Global Prosperity Is Reshaping Our Needs, Values, and Lifestyles, p. 99.

 Ecumenism 
Most churches have for a long time showed that they want to be tolerant with other belief systems, and in the 20th century Christian ecumenism (the uniting of Christians from different backgrounds), advanced in two ways.McManners, Oxford Illustrated History of Christianity, p. 581-584. One way was more cooperation between groups, such as the Edinburgh Missionary Conference of Protestants in 1910, the Justice, Peace and Creation Commission of the World Council of Churches started in 1948 by Protestant and Orthodox churches, and similar national councils, for example the National Council of Churches in Australia with Roman Catholics.

The other way was creating unions for different churches to join together. Congregationalist, Methodist, and Presbyterian churches joined together in 1925 to form the United Church of Canada,McManners, Oxford Illustrated History of Christianity. p. 413f. and in 1977 to form the Uniting Church in Australia. The Church of South India was formed in 1947 by the union of Anglican, Methodist, Congregationalist, Presbyterian, and Reformed churches.McManners, Oxford Illustrated History of Christianity, p. 498. And other such formations have been done by different Christian groups throughout the years.

Related pages

 Christian
 Catholicism
 Freedom of religion
 Judaism
 Islam

References

Other websites

 The Christian Bible in Basic English
 Christianity portal at Beliefnet
 The Dictionary of Biblical Theology is a Valuable Source The Dictionary of Biblical
 Religious Tolerance- Christianity