After one student was murdered, officials began to investigate the dead guy to see if he had written anything worth killing him over.”

When faced with these threats, many people are understandably reluctant to admit their religious doubts even to their closest confidants, making it difficult to gauge how widespread atheism actually is around the world. But there are signs that the numbers of atheists are sizable. A 2012 Win/Gallup International Poll, for instance, found that 19 percent of people in Saudi Arabia claimed not to be religious, with 5 percent identifying as convinced atheists—roughly the same proportion as in the U.S. That’s a surprisingly high number given the difficulties of exploring non-religious thought in this country, and the true figure may be greater; even if their responses remain anonymous, many non-believers may still have been reluctant to declare their religious doubts openly.