It really doesnt matter if the Son is eternal(having no beginning) or not, in terms of knowing Him. What it is, is an interesting theological discussion, and thats for sure, in terms of knowing about Him.
The same thing applies to whether God completely controls every thing or if man has a range of self determination in relationship to his life and times and service to(or not) God.
Most reasonable people accept a general theory in their own minds that fits in between the extremes. The extremes are usually proposed and promoted fervently by sectarian theologians.
The problem is, theologians get the idea that their perspectives on issues like this are the weight upon which men are “saved” or not, which is evidence of a true lack of understanding of the scriptures they purport to base their opinions on.
Salvation is a relationship with God. Jesus called us to know God and to love one another. Paul brought it down to knowing the Father and Son the Messiah through the Spirit and the word, and expressing that practically among our families and the community of believers and the community at large. Knowing about Him has value, but it doesnt save anyone, deliver anyone from sins grasp, or create a broken and a contrite heart in anyone.
Knowing God is where the depths are. Knowing about God is somewhere in the lesser, elementary principles of the oracles of God, a puddle by the shore little children splash around in because they are not yet mature enough to swim out into the deeper water, or go out sailing on the sea.
If Jesus has no beginning and is God very God by some mystical reality, existing as an eternal Trinity, or if Jesus was conceived in the mind of God as the “beginning” of creation, and is God in nature and eteranl power by inheritance and genesis, or if God by appointment like Joeseph to Pharoah, or whatever perspective one has on that… the understanding of it is not the basis upon which a relationship wth God is established, nor it is necessary to fully understand all the arcane variables of these theories to have a fruitful relationship with God and a deep understanding of the scriptures. The deeper I go the more I see the need to leave a little space for the mysteries.
Theologians like God in a box whose strings and ribbons are held in their hands. They get paid and build careers and gain status by the successful promotion of their views, not by the love of the truth- not to say that to be a theologian is to not love the truth- just to say that truth is a mystery, not a catechism.
God is not obliged to step into these boxes. We are not obliged to exalt them out of due proportion, because our values get jaded when we allow no space for these things to remain a bit misty around the edges, but instead hold them in our simple minds as absolutes to be battled over and applied to men as if they were the greatest questions, when they are not.
But as food for thought, and in the joy of plumbing the depth of mysteries and possibilities the nature of deity is an interesting and thought provoking discussion, as is the “free will/Sov” discussion, until folks who are sure the universe turns on their opinions start getting strident with one another and its no fun any more, because the walls have gone up and the fellowship has come down to absolutely categorizing things God has left as hazy views through a murky glass, so that we might at some point gain wisdom over knowledge and be humbled.
I think He did this on purpose, for His own protection, and the protection of the holy place in which He dwells, from the cacaphony of debate and the self assured ideas of men… so He could slip off out the side door and hang out with those who wonder at the glory of the stars and rejoice in the simple beauty of love and the innocence of childhood… out there in the deep water with those who have been called out of this dark world to keep the fires of love alive, to remain awed at the glory of God and seek to know Him in all His mystery, as the pearl of great price, and enter through the narrow gate, into the kingdom of God.