RELIGION & Why Muslims Are Rising Fastest and the Unaffiliated Are Shrin

by Pew Research Fact Tank, 4/2/15.

Why Muslims Are Rising Fastest and the Unaffiliated Are Shrinking as a Share of the World’s Population

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The religious profile of the world is rapidly changing, driven primarily by differences in fertility rates and the size of youth populations among the world’s major religions, as well as by people switching faiths. Over the next four decades, Christians will remain the largest religious group, but Islam will grow faster than any other major religion. If current trends continue, by 2050 …