Through the lens of evolution, a belief in God serves a very important purpose: Religious belief set us on the path to modern life by stopping cheaters and promoting the social good. iStockphoto.com hide caption

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Moses (right), a gay Ugandan man seeking asylum in the United States, hides his face with a makeshift hood as he attends a press conference in Washington, D.C., in February. The press conference was organized to announce the formation of an event to "affirm inclusive values and call on all nations, including Uganda, to decriminalize the lives of gay, lesbian, bisexual and transgender people." Jewel Samad/AFP/Getty Images hide caption

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More than half of the world's Muslims live along the 10th Parallel; so do most of the world's Christians. It's a place where ideological -- and geographic -- conflicts often arise. iStockphoto.com hide caption

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An opponent of an Islamic cultural center and mosque planned near ground zero in Lower Manhattan holds a sign during a demonstration Sunday in New York. Activists both for and against the proposed Park51 project rallied supporters near the proposed building site. Chris Hondros/Getty Images hide caption

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Linda Rivera holds up a sign in opposition to the proposed Islamic community center near ground zero in New York. Seth Wenig/AP hide caption

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A new poll by Pew Research says that only 1 person in 3 knows President Obama is a Christian, while nearly 1 in 5 thinks he's a Muslim. Andrew Wardlow/AP hide caption

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