IF any of these things are true about the Bible, are they not also true of the Quran(Koran), The Torah, etc. ?
It’s based on how many older copies there are, I think, because of this: “currently we possess more than 5,500 manuscripts of the New Testament in Greek alone. No other document of antiquity even comes close.”
As for The Torah, the Scribes would have been tenacious at copying with perfectionism. Have no idea about any others, nor are they worthy.