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キリスト教徒は2050年までに30億人に

Christian population growth
https://en.wikipedia.org/wiki/Christian_population_growth#Europe

Christian population growth is the population growth of the global Christian community.
According to a 2011 Pew Research Center survey, there were 2.19 billion Christians around
the world in 2010, more than three times as much from the 600 million recorded in 1910,
however this rate of growth is slower than the overall population growth over the same time
period.[1] According to a 2015 Pew Research Center study, by 2050, the Christian population
is expected to be 3.0 billion.[2]

From 1960 to 2000, the global growth of the number of reported Evangelical Protestants grew
three times the world's population rate, and twice that of Islam.[3]