oh, i totally get that once dean has proof he's all over it. He's a hunter, proof is one of the perks of the job, but yeah, it's an american thing.
i loved that buffy fought gods, and went to heaven and angel went to hell and there were the PTBs but we never had to accept God or the Devil.
i loved when the devil on SPN was as unproven and mystifying to demons as god is to people, some had faith, some didn't.
i am just not a fan of the whole god vs. devil, letting lucifer walk free thing. but then again, i am apparently old school in my SPN enjoyment. i love provenance, (the one with the creepy haunted picture) like woah, that's just some classic sam/dean doing what they do best action.