Ok let's go there.
Firstly the dead scrolls actually prove the careful dedication that scribes have always had to accurately transcribing sacred texts
This is evident in its 95% textual purity compared to the Masoretic texts who's earliest copies we had were from about 1000ad and are exactly what we read today!
Now it's not only a miracle these unique manuscripts have survived because papyrus only has a lifespan of about 50 years before it completely disintegrates
In addition, Christianity has been under severe persecution since its inception. In fact according to Islamic historians like Al Maqrizi, Muslims burned down 30,000 churches in Egypt in and Syria alone during the Fatimid caliphate. Not to mention the library at Alexandria.
So for you to pose the question against Christian's it's almost insincere because it's a miracle
Christian's are able to preserve any manuscripts at all!!
The fact that we have over 25,000 manuscripts of the New Testament that all agree to 99% textual purity
& dozens of manuscripts of the Old Testament from before the time of Jesus
That agree to over 95-98% textual purity with our Bible today. is nothing short of incredible
Islam did not have these problems,
Because their manuscripts were NOT on papyrus, but instead they were on Vellum (parchment) which can last millennia's under proper conditions.
Muslims under caliph Uthman in 652 had possession of lands stretching from Tripoli in the west to Afghanistan in the east, Turkey in the north, down to Yemen in the South.
Uthman standardized his Quran and BURNED ALL OTHER QURANIC MANUSCRIPTS
Then sent 5 Qurans out to Basara, kufaa, Damascus, Mecca, & Medina
So... if Christian's can provide multiple complete manuscripts not missing one page hundreds of years prior to Muhammad
Why CAN'T Islam produce NOT ONE single complete manuscript from the 7th century?