But if this is what you truly believe, then you have no foundation whatsoever to debate from. That means that your position holds no absolute authority either.
From the human perspective I do not believe there is an absolute authority. The variable and conflicting claims of absolute authority among humans over time is evidence of this view and problem,
I have foundations first in scientific, archaeological and historical academics concerning question of the scientific and historical reliability of scriptures.
I believe in God in harmony with science and religion. I am a Baha'i which believes in Progressive Revelation and not any absolute 'Truth' authority from the human perspective. I remain skeptical of all human beliefs, because of the limited fallible nature of humans. Any claims of authority evolves over time as humanity evolves spiritually.
Again, if you believe that there is no authoritative Bible/Scriptures, then nothing that you've studied for 60 years holds any foundational authority at all.
As far as what is authoritative Scriptures. You have Jewish, Christian, Islamic, Hindu, Buddhist and many variable claims in the divisions of these and other religions variable claims, which one is 'True' from the human perspective?
Your claim is that
@3rdAngel's position is just one "interpretation" of many which are all simply relative, and that there is no absolute truth. Not only is that incorrect, but it places your claims in the same basket of being simply relative to the opinion of the beholder with no authoritative significance at all.
By the facts of the reality of many diverse and conflicting belief is indeed one of many, and that is likely an understatement.
Personally, I believe the Bible is the final authority on all things
Yes, that is what you believe, and it is also on of many variable and conflicting beliefs what is the final authority on all things,
and though there is a trend today to discredit the Bible in every way imaginable,
I believe there is religious opposition to the Bible as much as Christian opposition to other scriptures like the Quran, and Jewish opposition to the NT and the Christian interpretation of the Torah. Jews discredit the NT and Quran, and the Christians discredit the Quran. Nothing new in history of these religions.
academic archaeology and history do justifiably question the historical validity of the scriptures such as the Pentateuch. This type of criticism is valid, because it was compiled after 600 BCE with no provenance in ancient history, and in conflict with the evidence of the history it records.
God integrated multiple security measures into His word to combat these. The fact that the Bible, when understood in its entirety - from cover to cover, defines and validates itself is the main reason that those who TRULY know it well are justified by God Almighty in their conviction of its authority on all matters.
I do not believe that any scripture can validate itself without outside evidence to confirm the text. This is mot relevant on historical claims.