Republican presidential candidate Donald Trump holds up a Bible that was given to him by his mother as he speaks during the Values Voter Summit in Washington, D.C., on Sept. 25, 2015. Jose Luis Magana/AP hide caption

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Jose Luis Magana/AP

What Does Trump's Promise Of A Nation 'Under One God' Really Mean?

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State Sen. Ferrell Haile, R-Gallatin (left), speaks during debate on a bill that would make the Bible the state book of Tennessee. At front right is Sen. Steve Southerland, R-Morristown, who sponsored the bill. Mark Humphrey/AP hide caption

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Mark Humphrey/AP

Hurricane Katrina holdout Hazzert Gillett reads his Bible in his New Orleans home in September 2005. The state's Legislature is considering a bill to make the Holy Bible the official state book. Brian Snyder/Reuters/Landov hide caption

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Brian Snyder/Reuters/Landov

Pope Francis delivers a speech during a meeting with young people last month in Cagliari, Italy. Franco Origlia/Getty Images hide caption

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Franco Origlia/Getty Images

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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Frank James/NPR