As far as the OP’s question, it doesn’t spark any outrage in me for reasons quite similar to those already stated: Dawkins is making tenuous allegations as a way of saying “I think he’s one us!” as opposed to others making bat-shit crazy allegations to say “he’s NOT one of us!” A world of difference.
I am also far more outraged with the “he’s a closet Muslim” buffoonery because it is so loaded with racism and bigotry that I think all right-thinking people should recoil from it instinctively. For those “charges” to be seen as bad require at the least a steadfast believe that Muslim=bad. Often it’s an even worse version: Obama is brown, and throughout the world many brown people are Muslims, and a tiny fraction of Muslims are out to harm the United States, so by lunatic logic, Obama must be out to harm the United States (and his last name even sounds a bit like Osama… need we say more???).
Though I have very little evidence, I expect our Commander in Chief is somewhere along the religious spectrum of most Christians I know: on a journey of faith, struggling with their beliefs, sometimes feeling closer to god/the church and sometimes farther as they go through life. I suspect a large number of Americans are “Christians” in the sense that they like/believe the moral basics of Christianity; take comfort in the rituals that mark the weeks, the months, and the major milestones of life and that they’ve known since youth; like the idea of raising children in a group that explicitly teaches that personal morality matters - all while harboring at least some doubt whether the actual son of God came to earth 2000 years ago to die for our sins.
Somewhat off topic, but the whole thread seems kind of silly to me: if we’re discussing politicians who may be closet atheists despite their claims to the contrary, I’d bet on the thrice-married Gingrich over Obama any day (and twice on Sunday).