Editor's Note: Stephen Prothero, a Boston University religion scholar and author of "God is Not One: The Eight Rival Religions that Run the World," is a regular CNN Belief Blog contributor.

By Stephen Prothero, Special to CNN

There has been much chatter in recent days about the reinjection of religious matters into the presidential campaign, with a focus on the increasingly bitter debate over Catholics and contraception. But Rick Santorum has just opened up a new and dangerous front in the culture wars.

We are now being asked to debate which of the Christians running for president is really a Christian. I am referring here not to questions about Mitt Romney, whose Mormonism according to many evangelicals is not the right theological stuff, but to questions about President Barack Obama.

In the past, the strategy on the right was to intimate that Obama was a closet Muslim (he is not.) It was too crass even for our crassest politicians to come out and utter this falsehood, so, when asked about Obama’s faith, the strategy was to say, “If the president says he’s a Christian, he’s a Christian.”

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Editor's Note: Stephen S. Schneck is director of the Institute for Policy Research and Catholic Studies at The Catholic University of America.

By Stephen S. Schneck, Special to CNN

For years, pollsters and political scientists have been stumped about Catholics.

On one hand, it’s been pretty clear that as American Catholics go, so goes the nation. George W. Bush narrowly won the Catholic vote in 2004 and won a second term. Barack Obama narrowly won the Catholic vote in 2008 and, with it, the White House.

It’s easy to see why Catholics are sometimes seen as the swing voters whose shifting political preferences swing elections.

Nevertheless, the idea of a Catholic bloc is patently ridiculous. As voters, American Catholics mirror the electorate as a whole, divided into Democrats, independents, and Republicans at about the same percentages as all Americans. And it’s hard to trace such political complexity to religious allegiance.

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(CNN)–CNN's Martin Savage talks with former President Carter about his new book's focus on faith.