I commend 1 Corinthians 10:1-13 to your attention as it illuminates Exodus 32:33 - Paul indicates that the judgment of physical death is the issue there rather than salvation.
All three verses that you quote relate only to the Incarnate Christ, and have no bearing as to His Deity. He IS always YHWH, when you can grasp what this actually means, then you will have a better understanding of the Person of Jesus Christ.
At this point the OP has left the topic whereby his first two verses have been answered in such a way that he can see his error. The OP has moved to a misunderstanding of Romans 7 and then Philippians 2. His misgivings have been answered.
The question left is whether he will abandon his works based soteriology or whether he will continue to cling to that which is shown to be false.
We disagree, in that God does not change, God the Father, Son of God and Holy Spirit were always God the Father, Son of God and Holy Spirit being the One God and did not change. So the Son was always the Son. Mark 13:32.
John chapter 1 says the Word was God. It also says the Word "became" flesh. How is that not a change?
Death, resurrection - that's not change?
God did not give the eternal Word for our salvation, He gave His uniquely begotten Son (John 1:14, John 3:16). If the second person of the Trinity was the Son in eternity past, who was the mother?
Rather, it was a change in how the Word is with us (Matthew 1:23, John 1:14). Of course the Word was God, nobody here believes otherwise. But you said He was always "the Son" in eternity past and did not change, offering no biblical support for those claims.
You also do not address the three "was" verbs in John 1:1 - why are these imperfects and not presents? Because something about the status "in the beginning" changed at the incarnation. It's pretty much the point of that chapter.