Are Qumran text of the Dead Sea a vital lesson to prophecy skeptics?

The Dead Sea scrolls housed many invaluable proofs of the preservation of Scripture, with copies of books of the Tanakh (Jewish Hebrew Old Testament) which are proven to be copies dating in and before the Maccabean Era of Judea. Two of these copies- the Book of Israel- also labeled Q and Greater Q- have evidence which puts them at 100 BCE. Why is this important? For centuries prophecy and Bible skeptics were absolutely sure that Isaiah was a Christian hoax or perhaps had interpolations of passages which would point to Christ- after the fact. They wrote countless exegesis and extrications on the reasoning and evidences of the "fraud." The Book of Isaiah, originally written circa 800 BCE is so full of messianic passages about the suffering for sins of this Man (see chapter 53) and His eventual reign, that it became known as "the fifth gospel." Now that it is proven to be a near perfect match to the Masoretic Text of Christianity, and written 100 years prior to Christ, naysayers once again appear foolish in doubting the Word of God. To this day, both places, names, and events which were once considered biblical hoax are being uncovered within the Fertile Cresant region, putting skeptics to silence. Christ once said that if His people were to keep silent, even the rocks would show the glory of God and confess. How very prophetic that was, that before archaeology existed, Christ knew the earth would one day uncover the countless truths of biblical history. Yet even if one only had the proof of the book of Isaiah to verify the prophecies of Christ, it alone is astonishing and prophetically accurate and written BEFORE THE EVENT.