“New Atheist” Richard Dawkins describes himself in this interview (which includes a brief video snippet) as an agnostic, rather than an atheist. Interesting, coming from the author of The God Delusion. And fair enough. Atheism is a belief every bit as much as faith in God. Dawkins is smart enough to realize that claiming a faith in God’s non-existence undermines his arguments against those who claim a faith in God’s existence.
I haven’t read much Dawkins, but I saw he also wrote a book called The Magic of Reality: How We Know What’s Really True. I’d be more interested in reading that than The God Delusion. I wonder, as well, if you replaced Rowan Williams in that interview with a postmodernist thinker, how he’d react to the idea that reality is just a social construct.