Well, I suppose a lot of believers just accept what has been passed down to them and don't dwell on the deeper side, if at all. The intellectual conflict is thereby sidelined. After all, major religions tend to discourage critical questioning (Y'know, threats of heresy, excommunication or worse, that sort of thing). I also suppose that billions of people care not a jot about God or religion. I have met some stupid atheists, but they tend not to be stupid about their atheism, on the whole. An avowed atheist will, at least to some extent, have engaged with the arguments and arrived at a personal conclusion. When that conclusion is that there is next to no chance of the existence of a being who trumps all the laws of nature and who can never be explained and for whom there is no evidence, it could hardly be irrational. It just may turn out to be wrong, as even Dawkins admits, but certainly not irrational.