Since I'm not familiar with the quote, I am not sure to whom it would be correctly ascribed, but I feel compelled to point out that your picture, Bingo, is of Hawking, a much more recent atheist, not Dawkins, who has held his views for some time.

That said, I somewhat see your point, though I'm not in entire agreement with Dawkins' ultimate conclusions.

As for the spread of Christianity, it is incredible. The Roman Empire is much to credit, just as the imperialism of Islam in its earliest centuries caused its meteoric rise. Still, Christianity tends to have had a greater appeal, including among the native inhabitants of the Americas.

As for JWs, while I have my own grievances, I also have a hard time vocalizing them since they are so often compared to Mormons with their zealous missionary efforts. I tend to believe and hope that Mormon missionaries are a little more thoughtful in general. And besides that, they're right about what they preach ;)