Question: Who wrote the book of the new testament?

Disambiguated questions and answers:
context: No context provided
question: What religious group wrote most of the New Testament?
short_answers: Jewish disciples of Christ

Jewish Christians

context: The books of the New Testament were all or nearly all written by Jewish Christians—that is, Jewish disciples of Christ, who lived in the Roman Empire, and under Roman occupation. Luke, who wrote the Gospel of Luke and the Book of Acts, is frequently thought of as an exception; scholars are divided as to whether Luke was a Gentile or a Hellenistic Jew. A few scholars identify the author of the Gospel of Mark as probably a Gentile, and similarly for the Gospel of Matthew, though most assert Jewish-Christian authorship.
question: Who wrote part of the New Testament and is generally thought *not* to be a Jewish Christian?
short_answers: Luke
wikipage: New Testament

context: No context provided
question: Who wrote the gospels of the New Testament?
short_answers: Matthew, Mark, Luke, John

context: The Pauline epistles are the thirteen books in the New Testament traditionally attributed to Paul of Tarsus. The anonymous Epistle to the Hebrews is, despite unlikely Pauline authorship, often functionally grouped with these thirteen to form a corpus of fourteen "Pauline" epistles.
question: Who wrote the Pauline epistles of the New Testament?
short_answers: Paul of Tarsus
wikipage: New Testament

context: The author of the Epistle of James identifies himself in the opening verse as "James, a servant of God and of the Lord Jesus Christ". From the middle of the 3rd century, patristic authors cited the "Epistle" as written by James the Just. Ancient and modern scholars have always been divided on the issue of authorship. Many consider the epistle to be written in the late 1st or early 2nd centuries.
question: Who wrote the Epistle of James in the New Testament?
short_answers: James, a servant of God
wikipage: New Testament

context: The author of the First Epistle of Peter identifies himself in the opening verse as "Peter, an apostle of Jesus Christ", and the view that the epistle was written by St. Peter is attested to by a number of Church Fathers: Irenaeus (140–203), Tertullian (150–222), Clement of Alexandria (155–215) and Origen of Alexandria (185–253). Unlike The Second Epistle of Peter, the authorship of which was debated in antiquity, there was little debate about Peter's authorship of this first epistle until the 18th century. Although 2 Peter internally purports to be a work of the apostle, many biblical scholars have concluded that Peter is not the author. For an early date and (usually) for a defense of the Apostle Peter's authorship see Kruger, Zahn, Spitta, Bigg, and Green.
question: Who wrote the First Epistle of Peter?
short_answers: Peter, an apostle of Jesus Christ
wikipage: New Testament

Long answers:
long_answer: The books of the New Testament were all or nearly all written by Jewish Christians (Jewish disciples of Christ) who lived in the Roman Empire, however, not all the authors were Jewish Christians. It is believed that disciples Matthew, Mark, Luke, John wrote the gospels of the New Testament. The other books like the Pauline epistles are traditionally attributed to Paul of Tarsus, the Epistle of James is attributed to  James (a servant of God), while Peter, an apostle of Jesus Christ wrote the First Epistle of Peter. A number of scholars are divided as to whether Luke (who wrote the Gospel of Luke) was a Gentile or a Hellenistic Jew. 

long_answer: The New Testament of the Bible is primarily written in parts with the majority of it written by Jewish disciples of Christ. Matthew, Mark, Luke, John wrote the gospels. The First Epistle of Peter was written by Peter, an apostle of Jesus Christ, Epistle of James was written by James, a servant of God, and the Pauline Epistles was written by Paul of Tarsus.