Yes, that's it exactly. There has never been an atheist president, because people wouldn't vote for them. Politicians have to at least pretend to be Christian, because it gets them more votes. Apparently polls show people would sooner vote for a Muslim than an atheist, which I'm not sure that I believe.
It may seem where when you look at it from the inside, but looking at it from the outside it's like watching two casinos arguing who has best odds on their slots. Both groups have a huge shared culture and set of behaviors and end up arguing about minutia. Like fanboys in any culture, if you're on the inside, you'll be completely unable to see this.
Atheism, on the other hand, would be like saying that both casinos are a ripoff and you're not going to win anything by going to either one of them. Anyone that has bought into gambling is going to be very unhappy to hear you say that.
