Before all else, Jesus is God.
He did not become a god, or receive godhood, nor was he a created being. He was with the Father and Holy Spirit before the creation of the universe.
But in order that we might understand who God is, he entered his own creation, and became a man, without giving up his divine nature. He lived a sinless life in that part of the world that was governed by Herod the Great under Roman rule.
Eventually, he was brutally executed by the secular government for the supposed religious crime of declaring himself to be the Messiah, the Promised King from David’s line.
In an event both unprecedented and predicted, God vindicated Jesus and restored him to life. His death recalls the sacrificial system which covered the sins of those in covenant with God. Because he was a man without sin and because he went willingly to death, his sacrifice was sufficient to erase the sins of all who come to the Father through him.