God is one. Deut. 6:4
Y'shua/Jesus did not know the mind of God. Matt. 24:36; Mark 13:32
Y'shua/Jesus was made sin, for us, on the cross. This cannot be done by God, because it's against his nature. 2 Corinthians 5:21
Y'shua/Jesus was the Son of God and the Son of Man. Even though a God/Son is within God's nature, but being a man cannot be done by God, because it's against his nature. Luke 1:35, Mark 14:62
I honestly believe that the first one, in the Bible, that fully understood this, was Thomas, when he proclaimed, in John 20:28, that Y'shua/Jesus is his Lord and his God.