[NivexQ]

I think there are a lot more atheists in the US than many people believe.

According to polls
15% of the adult population has no religious belief or affiliation.
5.2% either didn't reply or "didn't know"
The rest have an affiliation with some kind of religious group

I know that I'm still technically "affiliated" with the catholic church, but I don't believe in a god. I have many friends who are in the same boat. I think a lot of people go to church out of an obligation to feel accepted and appear "normal".

Go to a catholic church on any sunday and look at the amount of people there.
Then go to that same church on Christmas day. It probably quadrupled.

I'm sure at least 30%-50% of those people that only attend Christmas/Easter have no, or very little, belief in a god.