In the middle ages you would have burned at the stake for that heresy!
Jesus isn't half God, half man. He's all God and all man, and there's only one God.
Therefore he's also his own son, and he had to truly die (but only for 3 days) as a sacrifice to himself, to convince himself to forgive you for being the way he created you.
Then he came back for a bit before his human body physically rose up to heaven, where he sits at his own side.
But he'll come back again very, very soon. He just didn't get around to it in over 2000 years.
Get it right!