God, or rather his presence, is featured in The Messengers.
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God is not seen in the series. However, it is indicated he exists and is the father/creator of the Devil.
Rose mentions that the Devil was cast down from Heaven. God then gave the Angels of the Apocalypse gifts in order for them to show humanity is worth saving by preventing the Rapture.[1]
The Devil mentions having a complicated relationship with his father. He states his father was strict and controlling.[2]