I am an American, and not an atheist -- but I'm also not a Christian, and that question would have taken me aback too. In fact I'm quite sure I've never been asked that in my life. I would have been tempted to say something sarcastic like, "you really should get out more; there are people in this world who aren't Christians" but really, the guy was just trying to answer your question -- the reality being, I suppose, that everything there was to do in that town was organized by sect.