Well, I guess there are lots of non-Bayesians among non-believers too. And I've heard quite a few believers who, while they were likely not familiar with the concept of probability, made a distinction between belief and knowledge (IIRC, a priest saying “the devil believes in God more strongly than any man, including the Pope: he knows God exists because he has seen him, unlike the Pope who hasn't and so might still have some doubt”.)
Clearly the Devil should be more rational. How does he know he's not a soul in a vat?
http://bigthink.com/think-tank/neil-degrasse-tyson-atheist-or-agnostic
Apparently Dawkins and Tyson give a non-zero probability to "God". Which is pretty much what is expected of a rational person. And of course it will be used by theists to say "They aren't really sure!"