Bush's Doctrine of Infallibility?

Maybe I'm overstating it, but David Kaiser reports on a conversation that Bush had with historian Andrew Roberts:

"The president confided to Roberts that he believes he has an advantage over Churchill, a reliable source with access to the conversation told me. He has faith in God, Bush explained, but Churchill, an agnostic, did not. Because he believes in God, it is easier for him to make decisions and stick to them than it was for Churchill."

While Christianity does promise believers quite a bit (eternal life, et cetera) I was unaware of any scripture or church tradition that says believers have an easier time making decisions or that the decisions believers make in their jobs are inherently more likely to be correct. Of the many consolations offered by religion, I am not aware that "making decision is easy" has ever been one of them.