Perhaps they don't want to waste time arguing with ignorant folk who think they are superior and don't get it, never will get it and don't WANT to take the time to understand their point.
Exactly right. There are all sorts of religious people, obviously, and some of them are really quite bright and are not afraid to be challenged but this ain't really the place for that. Even so, in the past some have tried to discuss in a sensible manner but some of the more vocal Dawkins followers on here feel they are so superior and see believers as really just a bit dim who if they could just be logical for a moment would surely see the stupidity of their ways. As it happens the brightest guy I've ever met is a Christian – and I've met a lot of bright people.