Bestseller is a somewhat manipulated term; for instance, if you sell 9,000 copies of your book in the first week of it's release it'll make the NY Times best seller list, however it only takes 3,000 sales to make the Wall Street Journal's best seller list.
I agree, but we're not talking about a mere 9,000 or 3,000 copies respectivelty...I'm speaking over 2 million for the God Delusion alone:
http://en.wikipedia.org/wiki/The_God_Delusion
As of January 2010[update], the English version of The God Delusion had sold over 2 million copies.[5] It was ranked No.2 on the Amazon.com best-sellers' list in November 2006
Now, this isn't to say (nor does it do anything to prove) that people are "follwoing" people like Dawkins, but his words do carry influence over people who read his material.
I am personally fascinated by atheism, which is why I have interests in people who feel like he does, and why.
