While I understand that there is a lot in religion that is worthy of mockery, I also understand that there is an emotional element that is not so wise to mock. If you really want to win peoples hearts and minds, mockery is probably not the best way to get them in a chatty mood. It is more likely to get them reaching for their concealed weapon of choice.
The weird thing about this comment by Dawkins is that I have seen him in conversation with several religious figures and he is ALWAYS very, very respectful. I'd like to see the full speech, rather than just one line, perhaps, taken out of context.