It is interesting. Most folks here clearly seem to think that Wolf had prior knowledge of her atheism. Oddly, and for different reasons, Glenn Beck had the same take.
I could be completely wrong here, but I see the whole interview really differently.
Wolf Blitzer is a NY Jew. All this "thank the lord" and "do you thank the lord?" is just not part of the NY Jewish vernacular.
My take is this. His visit to the Heartland was a visit to a foreign culture, and he was overcompensating in an almost comical attempt to fit in. Like a springbreaker in Mexico, wearing a sombrero to fit into the local culture, or white suburban kid trying to speak "ghetto" to a group of black grad students from Columbia University. He made a set of assumptions, based on ignorance. And it blew up in his face.
And honestly, I think I might have made the same mistake myself. I would not have asked folks if they "thanked the lord" but if I found myself in that region, I would probably ASSUME that everyone was a fundamentalist Christian. And my assumptions would be based on my ignorance. I would look at the human beings around me differently. Through the filter of my own biases. And that might make me act a little weird and unnatural. I think that is what Wolf did.
But I could be wrong.