The world's fastest-growing religion is...

Islam, the world’s fastest-growing faith, will leap from 1.6 billion (in 2010) to 2.76 billion by 2050, according to the Pew study. At that time, Muslims will make up nearly one-third of the world’s total projected population of about 9 billion people.

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Christianity is expected to grow, too, but not at Islam’s explosive rate. The Pew study predicts Christians will increase from 2.17 billion to 2.92 billion, composing more than 31% of the world’s population.

This means that by 2050, more than 6 out of 10 people on Earth will be Christian or Muslim. And, for perhaps the first time in history, Islam and Christianity would boast roughly equal numbers.

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