Of course, I don’t exist. I’m a figment of my own imagination.
We exist AND we acknowledge those scriptures–We obviously interpret them MUCH differently and in light of other scripture.
To your Isaiah verse I think you should read it in conjunction with and in light of these other Isaiah verses:
“Ye are my witnesses, saith the LORD, and my servant whom I have chosen: that ye may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me. I, even I, am the LORD; and beside me there is no saviour.” (Isaiah 43:10-11)
“Tell ye, and bring them near; yea, let them take counsel together: who hath declared this from ancient time? who hath told it from that time? have not I the LORD? and there is no God else beside me; a just God and a Saviour; there is none beside me. Look unto me, and be ye saved, all the ends of the earth: for I am God, and there is none else. ” (Isaiah 45:21-22)
I believe the intent was that there is only one way for the inhabitants of this earth to be saved. We have only the Godhead revealed in the bible the unity of three gods–our echad elohim or “one gods.” Just like there are many fathers in the world each person only has one biological father and we can not change that; I believe there are many gods, but for us on earth there is only one and just like I can’t change my parentage we can’t change our God. He always has been and always will be our God, and he’s not going to step down and let another take his place. My own father could to me say “I am your father and there is none else, there is none beside me, and none like me.” Spoken to me he would be correct. It is the same thing reiterated in the New Testament by Paul. “For though there be that are called gods, whether in heaven or in earth, (as there be gods many, and lords many,) But to us there is but one God, the Father, of whom are all things, and we in him; and one Lord Jesus Christ, by whom are all things, and we by him.” (1 Corinthians 8:5-6)
To Ephesians I say:
1 Lord + 1 God the Father of all = 2 beings. Which is not monotheism. Which is the same thing noted in the Corinthians verse– 1 God the Father + 1 Lord Jesus Christ = 2 beings.
Edited to add a reference to Christian Polytheists: