aged ecumenical anthropologist
What you just spelled out above is a form of the Trinitarian concept.There is only 1 God.
John 4:24 says that the 1 God is a Spirit (Note it says a Spirit not 3 persons)
Ephesians 4:4 lets us know there is only 1 Spirit
In 1 Corinthians 8:6 Paul said that to us there is but 1 God - the Father
God is a Spirit and he is holy. He said in the last days I will pour out my Spirit on all flesh. Joel 2:
So the Holy Spirit is not another person - it is one and the same Spirit. Who was the Father in Matthew 1:18-20? She was found with child of the Holy Spirit. The Holy Spirit is the Father, not another person of the Godhead.
YHWH, The God of the old testament was a Spirit and didn't have blood to shed for man's sin. He looked out across the expanse of time, and saw that there would be no one without sin, to be that perfect sacrifice. He said My arm is not shortened, I will do it myself. He overshadowed the virgin Mary, and made himself a body. He was the Father of that body, so he could call it his son. But he dwelt in that body, and he sacrificed the fleshly body for the sins of the world. It wasn't another person, it was God himself dwelling in a fleshly body. The scripture says God was manifest in the flesh - he appeared in a body.
To wit or to know that God was in the Messiah reconciling the world to himself. 2 Corinthians 5:19
That's why the Messiah said things like, I and my Father are one. If you have seen me you have seen the Father. The Father that dwelleth in me he does the works. John 14:7-10 Now have they both seen and hated both me and my Father.
It wasn't that fleshly body doing the miracles, it was the eternal Spirit dwelling in the body that worked the miracles. It wasn't that fleshly body that was before Abraham, it was the Spirit dwelling in the body.
He was both Father and Son, the flesh was the son, and the eternal Spirit dwelling in the flesh was the Father, just like the prophecy in Isaiah 9:6 had said - Unto us a Son is given - He shall be called the Mighty God, and the everlasting Father.
There is a lot more proof, but I will leave it at this for now. Hope this helps. If you have questions, please ask.
In Catholicism, it's referred to as "the Mystery of the Trinity", namely that the exact relationship cannot be fully determined because our human minds are finite.