As a devout atheist (lol) I think this is rather dumb. In God We Trust on a building doesn't force any religion on anyone. Think of it as whatever you most trust/believe in as God to you. I cherish reason above all else. So "In God We Trust" means "In Reason We Trust" to me. Granted it may not be that easy for others to cope with something but rather than fight an asinine battle find a way to make it work for everyone. But it goes both ways. Churches have billboards and it's no big. Atheist have billboards and everyone and their mother is out crying about how it's destroying the neighborhood. Granted I admit that some of the Atheist billboards are deliberately provocative and I don't necessarily agree with that. But a billboard telling me I'm going to eternal damnation for not following the same rules you do isn't very nice either. All in all it all comes down to choice and respect.
http://lukeprog.com/religion/gods.html
Why so much fighting?