Jamesone5 says:
How is Christ your God of the OT and not God of the NT? Did He suddenly get demoted when He came into the world? Then your God the Father took over? Where do we find that bit of nonsense in the Bible?
Philippians 2:7 King James Version (KJV)
7 But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men.
John 17:5 King James Version (KJV)
5 And now, O Father, glorify thou me with thine own self with the glory which I had with thee before the world was.
So you are right in a sense, Jesus, the God of the OT took on a totally different role as a servant and became like men.
We know this from his prayer that he had great glory with God the Father before his earthly ministry, and looked forward to having that glory again, but not on the earth. He was a servant and like men.
Now I see what your meant by "what happened to your God the Father"? Our God the Father stayed in heaven and
He sent God the Son(Jesus) to the earth, which Jesus says many, many times in the bible. And Jesus said many, many times that his God and Father was
in heaven.
So there was 2 Gods in heaven in the OT, God the Son was in charge and created and administered all through the OT, given the right, power, and authority to do so, by his God and Father, God the Father.
Then it was time for the incarnation of God the Son. It was time for Jesus to become flesh, and so 1 of the Gods, God the Son sent to the earth by the other God, and was born of Mary and became a man, and put his godhood away and during the NT times became a servant, until his resurrection, and after his resurrection he once again had the same glory given to him by God the Father that he had in OT times
Today, both Gods sit side by side in the heaven, waiting until the second coming of Jesus.
It comes down to Mormons or rather JS telling God He just cannot be 3 Personages. We will all see how that deceptions of Mormonism and so many others worked out in the end.
The Church of Jesus Christ does not tell God He cannot be 3 Personages. (your Athanasian creed calls them Persons, not Personages.) It is JS that says he saw 2 Personages standing before him in the air. We absolutely say they are 3 Personages, we just admit they are separate and distinct Personages, not all in 1 God. We also call them 3 Gods unashamedly.
Because they are 3 Gods, God the Father(1), God the Son(2), and God the Holy Spirit(3).