Richard Dawkins, founder of The Richard Dawkins Foundation for Reason and Science, speaks at the March 2012 "Reason Rally" on the National Mall in Washington, D.C. Allison Shelley/Getty Images hide caption

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Bishop McNeil, who isn't a cleric despite his name, speaks to reporters Wednesday at a news conference to introduce the Freethought Equality Fund PAC. Frank James/NPR hide caption

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Must religion be embodied in a god or gods, such as Ceres, the Roman goddess of agriculture? Hulton Archive/Getty Images hide caption

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As religious as this country may be, many Americans are not religious at all. The group of religiously unaffiliated — dubbed €œ"nones" €-- has been growing. iStockphoto.com hide caption

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Author and evolutionary biologist Richard Dawkins at NPR headquarters in Washington, D.C., on Mar. 22. Doriane Raiman/NPR hide caption

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