Christian population growth
Christian population growth is the population growth of the global Christian community. According to a 2011 Pew Research Center survey, there were more than 2.2 billion Christians around the world in 2010, more than three times as many as the 600 million recorded in 1910. However, this rate of growth is slower than the overall population growth over the same time period. Summary. The Christian fertility rate is 2.7 children per woman, which is higher than the global average fertility rate of 2.5. Globally, Christians were only slightly older (median age of 30) than the global average  median age of 28 in 2010. According to Pew Research religious switching is projected to have a modest impact on changes in the Christian population. According to the "World Christian Encyclopedia", approximately 2.7 million converting to Christianity from another religion, "World Christian Encyclopedia" also cited that Christianity rank at first place in net gains through religious conversion. While according to "The Oxford Handbook of Religious Conversion", approximately 15.5  million converting to Christianity from another religion, while approximately 11.7  million leave Christianity, and most of them become irreligious, resulting in a net gain of 3.8 million. Christianity earns about 65.1 million  people due to factors such as birth rate, the religious conversion while losing 27.4 million people due to factors such as death rate, religious apostasy. Most of the net growth in the numbers of Christians are in Africa, Latin America and Asia. Fertility rate. The Christian fertility rate has varied throughout history, as with other fertility figures. The Christian fertility rate also varies from country to country. In the 20-year period from 1989 to 2009, the average world fertility rate decreased from 3.50 to 2.58, a fall of 0.92 children per woman, or 26%. The weighted average fertility rate  for Christian nations decreased in the same period from 3.26 to 2.58, a fall of 0.68 children per woman, or 21%. The weighted average fertility rate for Muslim nations decreased in the same period from 5.17 to 3.23, a fall of 1.94 children per woman, or 38%. While Muslims have an average of 3.1 children per woman—the highest rate of all religious groups—Christians are second, with 2.7 children per woman. The gap in fertility between the Christian- and Muslim-dominated nations fell from 67% in 1990 to 17% in 2010. According to a study published by the Pew  Research Center in 2017, births to Muslims between the years of 2010 and 2015 made up an estimated 31% of all babies born around the world. By the Pew Research Center's estimates, the Muslim fertility rate and Christian fertility rate will converge by 2040. Conversion. According to Pew Research religious switching is projected to have a modest impact on changes in the Christian population. According to a study by the Pew Research Center, it is expected to convert to Christianity 40,060,000 persons, while leaving Christianity 106,110,000 persons, thus, it is a net loss for Christianity nearly 66,050,000 between 2010  and 2050, and according to the same study, Christianity is expected to have the largest net loses through religious conversion. According to the "World Christian Encyclopedia", approximately 2.7 million convert to Christianity annually from another religion; "World Christian Encyclopedia" also stated that Christianity ranks in first place in net gains through religious conversion. While, according to book "The Oxford Handbook of Religious Conversion", which published by the professor of Christian mission Charles E. Farhadian, and the professor of psychology Lewis Ray Rambo, between 1990 and 2000, approximately 1.9 million people converted to Christianity from another religion, with Christianity ranking first  in net gains through religious conversion. According to "The Oxford Handbook of Religious Conversion", in mid-2005 approximately 15.5 million convert to Christianity from another religion, approximately 11.7 million leave Christianity, and most of them become irreligious, resulting in a net gain of 3.8 million. Christianity adds about 65.1 million people due to factors such as birth rate and religious conversion, while losing 27.4 million people due to factors such as death rate and religious apostasy in mid-2005. Most of the net growth in the numbers of Christians is in Africa, Latin America and Asia. By country. Americas. Argentina. A 2015  study estimates some 2,200 Christian believers from a Muslim background in the country, most of them belonging to some form of Protestantism. Data from 2013, show that 64,000 Argentine Jews identify themselves as Christians. Canada. According to 1991/2001/2011-Census, the number of Christians in Canada has decreased from 22.5 million to 22.1 million. A 2015 study estimates some 43,000 believers in Christ from a Muslim background in Canada, most of whom belong to the evangelical tradition. Mexico. According to INEGI, The number of Catholics grows annually by 1.7%. United States. The United States government does not collect religious data in  its census. The survey below, the American Religious Identification Survey (ARIS) 2008, was a random digit-dialed telephone survey of 54,461 American residential households in the contiguous United States. The 1990 sample size was 113,723; 2001 sample size was 50,281. Adult respondents were asked the open-ended question, "What is your religion, if any?" Interviewers did not prompt or offer a suggested list of potential answers. The religion of the spouse or partner was also asked. If the initial answer was "Protestant" or "Christian" further questions were asked to probe which particular denomination. About one-third of the sample was  asked more detailed demographic questions. Among the Asian population in the United States, conversion into Christianity is significantly increasing among Korean, Chinese, and Japanese. By 2012 the percentage of Christians in these communities was 71%, 31%, and 38% respectively. Data from the Pew Research Center states that, as of 2013, about 1.6 million adult American Jews identify themselves as Christians, most as Protestants. According to the same data, most of the Jews who identify themselves as some sort of Christian (1.6 million) were raised as Jewish or are Jews by ancestry. According to Pew Research, Christianity loses more people than  it gains from religious conversion. It found that 23% of Americans raised as Christians no longer identified with Christianity, whereas 6% of current Christians converted. This was in contrast to Islam in America, where the number of people who leave the religion is roughly equal to the number who convert to it. The National Catholic Register claims that in 2015 there were 450,000 American Muslim converts to Christianity and that 20,000 Muslims convert to Christianity annually in the United States. Religious Self-Identification of the U.S. Adult Population: 1990, 2001, 2008Figures are not adjusted for refusals to reply; investigators suspect  refusals are possibly more representative of "no religion" than any other group. Highlights: Asia. Saudi Arabia. A 2015 study estimates 60,000 Muslims converted to Christianity in Saudi Arabia. Oceania. Australia. A 2015 study estimates some 20,000 Muslim converted to Christianity in Australia, most of them belonging to some form of Protestantism.