God
From Super-wiki
The term "God" is used in Supernatural to refer to the Judeo-Christian deity.
The Christian God was first 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.
In 4.10 Heaven And Hell, Anna Milton tells Dean that only four angels have seen God.
- see also Demonology
