Why does Oneness deny Son as creator?

[Praxeas]

Originally Posted by Iron_Bladder

Please notice that I've used the word 'SON' as Oneness folk to my knowledge claim that the Son isn't an eternal Son, but that he came into existance at a point in time at behtlehem.

Only his humanity came into existence at a point in time, but God has always existed. He became the Son WHEN His humanity came into existence and united His Person and Divine Essence with a human nature