The origins of Islam

The world has 1 billion Muslims, including about 5 million in the U.S. What do they believe? Does the Koran justify violence?

How big is Islam?

The Koran is the most memorized book on earth, and Islam is the world’s second-largest religion. Muslims account for one-sixth of the human race—or around 1 billion people—and are the dominant population in 36 countries, from the Indonesian islands to the African plains. They divide loosely into two branches: the Shias, who are mostly to be found in Iran and Iraq, and the Sunnis, who constitute 90 percent of the Muslim world.

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