I don't find it that amazing that Dawkins believes nonsense like that. After all, just a couple of weeks ago, John Derbyshire admitted to Vox Day that, while it is impossible for him to believe in God, there's nothing that would necessarily prevent him from believing in leprechauns.
Of course Derbyshire can believe in leprechauns, but not God. God, by definition, would have moral authority over Derbyshire, while leprechauns would not.
That being the case, there might be unpleasant consequences if Derbyshire lived in such a way that he did not please God, whereas he can offend the sensibilities of leprechauns all he wants without any real punishment therefore.
It’s like this: a person wants to speed. He has two choices: (1) he can accept that speed limits exist, but that he chooses to be a lawbreaker, or (2) he can delude himself into believing that speed limits do not exist and, therefore, that there are no moral issues or legal consequences for his behavior.
That is all.
I've had atheists tell me that cabbages are atheists too, because cabbages don't believe in God. Behold, the miracles of unbelief.