So you agree there are many sons of men and many sons of God? So Jesus is really the firstborn among many brothers after all? Not human brothers, no, but spiritual brothers with the same Father.
Romans 8
28And we know that God works all things together for the good of
those who love Him, who are called according to His purpose.
29For those God foreknew, He also predestined to be
conformed to the image of His Son, so that He would be the firstborn among many brothers.