Nearly 1 in 4 of the world's people practice Islam, according to a report from the Pew Forum on Religion and Public Life. The exact number — 1.57 billion — is a first for a population whose size was previously estimated at anywhere from 1 billion to 1.8 billion. The report also tracked where Muslims live, revealing, for example, that Asia is home to 60 percent of adherents, China has more followers than Syria, and Germany has more than Lebanon. About 2.1 billion to 2.2 billion people are Christians.
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