Did Bush Believe His Own Lies?

Dreher asks a question I've pondered before:

Whenever I'd hear President Bush saying, repeatedly, "We do not torture," I never could make my mind up whether he was saying that out of political expediency, or whether he really believed it -- and that he had to tell himself that our torturing of detainees wasn't torture, because as a devout Christian, that's the only way his conscience could let him rest. I still wonder.