The country has grown less religious since the 1970s, while frequent churchgoers are now much more likely to vote Republican or support the Tea Party, according to recent studies.
As a result, faith-filled rhetoric and campaign stops make Americans appear more Christian than they really are, according Mark Chaves, a Duke University professor of sociology and religion.
The rise of megachurches, with their memberships in the thousands, also fuels the misperception that most Americans attend services weekly, when only one in four Americans actually do, he added.
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