God
From Super-wiki
So far, the Christian God has only been referenced directly in 2.13 Houses of the Holy. As the boys investigate a series of murders where people say they were directed to kill by an angel, a messenger of God, we learn that Sam prays on a regular basis. When Dean witnesses a man who attacked a woman killed in a freak accident, he wonders whether he had seen 'the hand of God' at work.
- see also Demonology