Call them “born again” undecideds: Republicans exploring bids for the presidency in 2012 have ramped up their religious fervor and sharpened answers to questions about faith in an effort to court social conservative voters in key early primary states.

“I believe in God. I am Christian. I think the Bible is certainly, it is ‘the’ book,” real estate mogul Donald Trump told the Christian Broadcasting Network last week after catapulting to second place in a poll of unofficial GOP presidential contenders.

But as voters begin to scrutinize the lives of a wide-open field of unofficial GOP presidential contenders, several personal histories might raise red flags in some religious circles.

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