Rod Dreher asks:
Well that's easy: because, on the subject of religion they are crashing bores. More so, in fact, than their religious counterparts. After all, the latter generally confine themselves to arguing that you are wrong (and, of course, damned) whereas Dawkins et al also demand that you acknowledge they are right. Worse still - and I say this as someone with a faith deficit - they insist upon going on and on and on about it. We get it, chaps.