Why would an atheist go to church? To seek out a god?
No more than a historian seeks out Ra or Hathor by researching Egyptian religions.
Those religions are dead now. The modern ones can still be researched, without searching for a god. Just for research sake. In my case it helps with my arguments against religion, and I think it's just an interesting subject to begin with.
So, I went to a baptist one. I was even offered a bunch of DVDs and a booklet on creationism from the pastor, but when I looked at them, pointed out the mistakes and offered a whole lot of proof for evolution, no one could give me an answer. So much for that.
I wrote up a more thorough 'review' of a Mormon service, which is here if anyone's interested: http://www.sendspace.com/file/l4bcsa
I think I'll do more of this kind of thing. Instead of debating the same old points over and over in forums with closed minded people, I've decided for now to take the current atheist v theist culture war into the churches themselves to talk with anyone who feels they want to discuss these things. No pressure, no shouting, no anger. Just calm discussions with every day people.