The God of the Old Testament contrasted to the God of the New Testament: Could you help me sort out the idea that the God of the Old Testament is not the same God who was the father of Jesus, because I don't think that the Pentateuch (1st five books of the Old Testament) was written by Moses and the Nag Hammadi Texts? Rec: Lecture; Intro to the Old Testament. [John 5:37, John 8:54].