Why does Oneness deny Son as creator?

Originally Posted by Iron_Bladder

If God BECAME the SON, then you belevie God changed, this is why the Trinitarian creeds state that God took on flesh, and they reject as heresy the claim that GOD BECAME flesh. Secondly, how would you explain the Son being said to exist as the Son form before the creation at Hebrews 1:2, John 17:5, 17:24 etc.

Show me where the following portion of the Nicene-Constantinopolitan Creed says He took on flesh:

We believe in one God, the Father Almighty, Maker of heaven and earth, and of all things visible and invisible;

And in one Lord, Jesus Christ, the Son of God, the Only-begotten, Begotten of the Father before all ages, Light of Light, True God of True God, Begotten, not made, of one essence with the Father, by Whom all things were made:

Who for us men and for our salvation came down from heaven, and was incarnate of the Holy Spirit and the Virgin Mary, and was made man.