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What is the most popular religion in the world?

The most widely practiced religion in the world is Christianity. Over 2 billion people (about 33 percent of the world's population) consider themselves to be Christians.

About 1.3 billion people (20 percent) are Moslems, making Islam the second most popular religion in the world.

After Christianity and Islam come: no religion (9.3 billion, 15 percent); Hinduism (790 million, 13 percent); Buddhism (365 million; 6 percent); and Atheism (210 million, 4 percent).