So is it your opinion that Jesus was, for an infinite past, God the Son? One of the problems I have with the concept of God being God for an infinite past is that most who believe this also believe that God created all things from nothing. So at some point in the infinite past, nothing existed except God. This would mean that before God's very first creation, God existed for an infinite past before he created that first creation. So He, and as you are probably suggesting Jesus also, existed for an infinite past with nothing else in existence and not creating anything up until after eons and eons He finally creates that first creation. That to me seems extremely unbelievable. What a boring existence that must have been. So, no I don't believe that was the case.
Scripture tells us that the Father, through Jesus, create all things that were made.
John 1:2-3
2 The same was in the beginning with God.
3 All things were made by him; and without him was not any thing made that was made.
When I read these verses, I ask, "what do they mean by beginning?". What constitutes, "the beginning"? Why is this verse clarifying that things made by Jesus were made things? Are there things that are not made? Are there eternal things other than God himself? Maybe the beginning was when God himself started out his kingdom as a God. Maybe Jesus was the beginning of all the creations of God.
Revelation 3:14
14 And unto the angel of the church of the Laodiceans write; These things saith the Amen, the faithful and true witness, the beginning of the creation of God;
Basically there was a beginning to the creations of God. To me this does not mean that nothing else existed prior to that first creation but that there is eternal matter and intelligence and to create does not mean ex nihilo creation but to organize from existing intelligence and matter. Jesus was the first of all the creations of God and was the Firstborn spirit child of the Father. Through his firstborn son, he created from chaotic self-existing matter things that were made. From the beginning of God's kingdom as a God, Jesus was the first of all the creations of God. After being born of the Father, Jesus was selected to be with him as part of the godhead. Thus Jesus was with God from the beginning of his kingdom. I don't believe God was a God for all eternity past nor do I believe that Jesus was either. Eternity is a state of being and not just a measure of infinite time. Once God became a God, he was a perfect and unchangeable being. He would forever after be who he is as an eternal being. Eternity is a state of existence. For example, God lives in eternity as opposed to mankind on earth who live in a temporal existence that will eventually come to an end and transform into eternal existence. When God says he was God from everlasting to everlasting or from eternity to all eternity, I believe that he is saying that He was God before this temporal earth and will be God after this temporal earth existence. He is from eternity to all eternity. I don't think he is saying that he has existed as God for an infinite past. He is an eternal God because he exists as God in the state of eternity. Not that he was God for an infinite past.