Ever since Richard Dawkins' The God Delusion came out (a controversial, thought-provoking, brilliant read, by the way) I've been wondering what the German title might turn out to be. Now I know: Der Gotteswahn (see page 16 of this preview catalogue) Not a bad title I guess. And one that didn't pop up when I myself was thinking about a possible translation.
Not likely to be in any hotel room near you any time soon. Regrettably.