According to the Unitarian argument this is what we must affirm of the Father if the same argument proves that the Son is not God.
Nehemiah 9 v 6
King James Bible
Thou, even thou, art LORD alone; thou hast made heaven, the heaven of heavens, with all their host, the earth, and all things that are therein, the seas, and all that is therein, and thou preservest them all; and the host of heaven worshippeth thee.
There is no record in the NT that the angels worship the Father using the word latreuo to designate this worship. According to the Unitarians we must conclude from this silence that the Father is not God because this same silence proves that the Son is not God.