It's funny, because you sure wouldn't get an atheist running for the Republican slot, not a Jew or Hindu either. Nope, the Republican Party back in 1980 asked (begged, pleaded, did everything except get down on their knees and suck 'em) the true believing and feeling left out of it part of the Xian community in the US, which has a huge evangelical segment, a huge fundamentalist segment, a very large Pentecostal/Four-Square segment, and a lot of one-off 'minister by mail' joints in their fold. In the past this group didn't matter much. A huge segment of it never voted, didn't register - they didn't think it was proper to put the Lord into the political sector. The Catholics and the Mormons voted, in large numbers too, as did the main stream Xians your Methodists, Episcopalians, Unitarians, and the like. But the far-right fringe - which has a long standing historical tradition in the United States, it runs deep in the nation's psyche - was always (until Reagan) out in the cold.
America has a problem: It's filled with people who take the Bible seriously. America has a blessing: It's filled with people who take the Bible seriously. How does this blessing coexist with the curse derived from the same source: the Bible? The answer is that the Bible is a curse or a blessing depending on who is doing the interpreting. Sometimes belief in the Bible leads to building a hospital. Sometimes it leads to justifying perpetual war and empire building. Same book—different interpretation.
And the worst seem to have crept out of the woodwork and are attempting to take over. Known as Reconstructionists (also:Dominionism) seeks to reconstruct "our fallen society" along biblical lines. Specificially they seek to apply "the whole Word of God" to all aspects of human life: "It is not only our duty as individuals, families and churches to be Christian, but it is also the duty of the state, the school, the arts and sciences, law, economics, and every other sphere to be under Christ the King. Nothing is exempt from His dominion. We must live by His Word, not our own."
In this vission, all nations on earth should be obedient to the ancient Jewish/Christian version of "God's Law," so that the world will experience "God's blessings." Biblical salvation will then turn back the consequences of the Fall, and we'll be on our way to the New Eden. To achieve this "turning back," coercion must be used by the faithful to stop evildoers, who are, by definition, anyone not obeying all of God's Laws as defined by the Calvinist and Reconstructionist interpretation of the Bible.
Now, given that Sara and Michelle both have ties with such groups, the question is how much is OK, or proper to ask someone about their faith and how much their faith controls their lives. Now - and we know this because they pound this sand up our ass all the time - some of them LOVE talking about it whenever it's convenient and/or it's pandering to the audience with their religious twaddle, but ask them any serious question about it and it's off limits and out of bounds.
As indeed it may well be. Custom tends to prohibit such questions (Kennedy got some, but he's about the only one), there is a strict 'no religious test' for public office part of the Constitution that works against such questions and lines of attack.
Do know this: If that debate had been on MSNBC and Rachel Maddow or Chris Mathews had asked it heads would have exploded. But that it was an 'in' debate (Republicans Only) on friendly ground (FOX) it has opened the door to others asking the question. And that's going to be hard to put back in the bag now the the pubs asked it of themselves.
Oh yeah, we now have Rick Perry running. He's gov of a state that's undergoing like the worst drought in memory. It's real hot and dry. Yet, he denies global warming theory and other scientific solutions and supports having prayer meetings to end the drought. Is anyone going to question him on this 'policy'? (So far no answer to the prayers, Texas is still bone dry. Though perhaps EVEN MORE people are praying for the drought to continue. You never really know with prayer.)