Thank you for your response.
I must admit that Complex/One is a new word for describing God. However it says that same thing as the Trinity. I have seen the word Triune also used to convey the meaning of the Trinity.
God is One. No problem. God is also Three, correct or not? Three is the number that indicates complexity. Also personhood indicates complexity. If God is personal, God is both One and Three, has unity and complexity.
This seems to be the philosopher’s problem with the Biblical God. The philosopher wants God to be simple Being and thus impersonal, but the Biblical God is not. The Trinitarian God of the Bible is both Complex and One.
Divine simplicity may be central to the classical Western concept of God, but it is not basic to the Biblical concept of YHWH, I AM WHO I AM.
Yes, God the Father is the God Who Jesus prayed to and was the God of Israel, but this confirms that the God the OT is different from the God the NT, because Jesus does not pray to Himself. Jesus prayed to His Father.
We seem to disagree on one very important aspect of theology. I say that the New Covenant is not just an extension of the Old Covenant to the Gentiles. I and the basic Christian tradition says that the New Covenant is something new that God did in the world.
John 3:16 God so loved the world that He sent His only Beloved Son into the world, so that whoever believes on Him will not perish, but have everlasting life." That is not the covenant with Israel. That is not how God the Trinity worked in the OT.
Yes, Christians believe that the God of the OT was the same God as the NT, but the fact is the NT Trinitarian God revealed Godself differently in the NT than in the OT.
That is why I said before that God the Father is the God of the OT, while God the Son is the God the NT. I did not mean that they are two different Gods, since I indicated that they were members of the Trinity (whereas FMW did not.)
We learn from the Bible that our understanding of God evolves, which does not mean that God changes, but we do, because we are limited, mortal creatures.
We believe that there is God, but we have three faiths that define Who God is very differently, including Islam. How can we determine which is correct, because the future of our world depends on it?
As it happens, I have written a book, The Complex ONE and The Simple ONE, Relational Christianity and Absolute Islam in Today’s World, which compares the two faiths side by side so anyone and everyone can see how they are alike and different, and determine for themselves.