When Jesus was a man on Earth, did he cease being God in Heaven? Was there a Trinity prior to the birth? Were there two

[Ocelot II]

1. The Trinity is a confusing and very vague concept.

John 1 says Jesus was always God:

In the beginning was the Word, and the Word was with God, and the Word was God. He was with God in the beginning....The true light that gives light to everyone was coming into the world. He was in the world, and though the world was made through him, the world did not recognize him. He came to that which was his own, but his own did not receive him. ...The Word became flesh and made his dwelling among us. We have seen his glory, the glory of the one and only Son, who came from the Father, full of grace and truth.

I think the Council of Nicaea, which mostly came up with the idea, potentially tied themselves into a conceptual knot. As inheritors of Jewish monotheism, they couldn't claim that Jesus was a god separate from the God, of which there is only one; but at the same time they had to acknowledge that Jesus was divine or there was no point in the new religion at all. So the essence of God has three parts: the creator, the redeemer, and the essence of God that lives in and inspires people. But they are all God, and God is simultaneously in heaven and on earth. And no, I don't grok the whole thing at all.