The Authority, God, the Creator,the Lord,Yahweh, El, Adonai, the King, the Father, the Almighty - those were all names he gave himself.
He was never the creator. He was an Angel-the first and true angel, the most powerful, but he was formed of dust as we are, and dust is only a name for what happens when matter begins to understand itself, and dust is formed.
The first angels condensed out of dust, and the Authority was first of all. he told those who came after him that he had created them, but it was a lie.
One of those who came later was wiser than he was, and she found the truth, so he banished her.
Amber Spyglass