Jesus is a man, a flesh body. The body to hold the express image of God the Spirit son.
James 2:19 You believe that there is one God. You do well. Even the demons believe—and tremble!
Why do demons tremble? They tremble because the Spirit can change their non-material body to a material body in an instant.
Why does that make them tremble? Because material bodies can be destroyed and they don't want to be destroyed.
Did God make a material universe? Yes, and he can exist in the material world, he walked and talked with the first humans.
The spiritual dimension is not a prison from which God cannot escape.
God made flesh and he can be flesh anytime time he wants to be.