I'd like to draw attention to the way he fields this question. He essentially says he's an atheist without saying he's an atheist. I think it's very non-confrontational without being apologetic. There's definitely something to be said for his sense of tact (which many of us, including myself, lack).
I like it, and I don't like that I like it. I know his answer is superior to anything I would have said. It's not disenfranchising, it doesn't point a finger and say "No, you're wrong". It does what the out campaign is trying to do by demonstrating that we can be caring, understanding, good people for whom god is simply an idea that doesn't work.
Should he have been less, um ... political? (I suppose that's the right word) ... I can't, as much as I'd like to ... imagine how a stronger assertion would have been more effective.