I think Dean *wants* to believe, and in that moment of terrible extremity, he hoped that the same God who ordered him yanked out of Hell the first time would call up another miracle, now. It makes a certain sense, because why waste a miracle, right? And picking up the Bible might have been sort of like picking up the phone, in Dean's panicked mind, and hoping like crazy someone was on the other end.

Something like that, anyhow. It made my heart just ache, that's for sure.