Just the facts on religion.

Christianity Adherents

Christianity has about 2.2 billion adherents worldwide. This number is based on global surveys and estimates of 2.17 and 2.18 billion from 2010-11, rounded up a bit to correspond with increases in world population since then.

Christian population statistics count all those who identify themselves as "Christian," which includes Catholics, Orthodox Christians, Anglicans, Protestants, non-denominational Christians, Mormons, Jehovah's Witnesses, and many other groups.

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Further Reading