Christians are the world’s biggest religious group, numbering some 2.2 billion people, according to a study released Tuesday by the Pew Forum on Religion and Public Life.

Pew assembled data on the size and geographic distribution of eight major religious groups, including non-believers.

It found that Christians make up about 32 percent of the world’s population, followed by Muslims, the second largest group, with 1.6 billion adherents.

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