He called himself a "life-long Quaker and a church-going Christian," and at first there was no reason to doubt him.
He played piano in the church, taught Sunday school, and praised Jesus at revivals. His mother thought he was going to be a missionary. His friends said he would be a preacher.
We now know this former Sunday school teacher as "Tricky Dick" or, more formally, President Richard Nixon. He was one of the most corrupt and paranoid men to occupy the Oval Office. Nixon gave us Watergate, but he also gave presidential historians like Darrin Grinder a question to ponder:
Does a president's religious faith make any difference in how he governs?
"I don't think so," says Grinder, author of "The Presidents and Their Faith," which examines the faith of all American presidents.
"If I asked George W. Bush what he thought about torture, I think outside the presidency he would say he hates it," Grinder says. "But he'd do it for the country if he thinks it's right in terms of American security."
We elect a president every four years, but perhaps we also elect a high priest. Ever since George Washington spontaneously added "so help me God" to his inaugural oath, Americans have expected their presidents to believe in, worship and publicly invoke God.
A presidential candidate who doesn't meet these religious expectations won't go far, Grinder says.
"It's going to be a long time before anyone who openly admits that he or she is an agnostic or an atheist is elected," Grinder says. "We tie character and religious beliefs together."
Piety and presidential greatness don't always mix