Why does Oneness deny Son as creator?

Originally Posted by Chan

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.

This portion of the creed doesn't state that.