Apparently Dawkins and Tyson give a non-zero probability to "God". Which is pretty much what is expected of a rational person.
And those who do are irrational or not Bayesians? I think that quite a few people who proclaim that "God" does not exist would assign a nonzero probability to its existence if you asked them directly.
If you asked me if I exist I'd reply "Yes, certainly!"...0 and 1 not being probabilities notwithstanding.
If you asked me if I exist I'd shift into philosopher-mode and probably not give you a straight answer at all. But the point is clear.
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!"