If there be a religious test for presidential candidates, Washington Post columnist Richard Cohen suggests that Mitt Romney shouldn't be the first grilled:
...if the question is whether a candidate's religion should be of concern to the American people, the candidates who should respond are those who repeatedly assert that faith, not ideology, is what drives them and even leads them to question evolution. Such a candidate is Mike Huckabee, the affable former governor of Arkansas and, more to the point, an ordained Baptist minister. He raised his hand in the negative last May when all the GOP presidential candidates were asked whether they believed in the theory of evolution.
In doing so, Huckabee failed a religious test for the presidency established inadvertently by George W. Bush