You are mistaken again; the Dead Sea Scrolls are still being studied and scholars have no definitive explanation of their origin...
No definitive explanation of their origin? You are kidding, right? They are Hebrew writings (the language of the Jewish people). They narrate the history, myths, legends and religious doctrines of the Jewish people. They were written and used during a time and in a place of Jewish cultural precedence and control.
Are you going to argue that there is no definitive origin of Ebers Papyrus? Are you going to argue that manuscripts written in Egyptian hieroglyph or hieratic can't be definitively explained to be Egyptian in origin? Are you going to argue that Egyptian artifacts are actually Roman artifacts because Rome once conquered most of Egypt?
Please. You are being absolutely ridiculous.
(Not to say that they aren't of interest, possibly, to Christian historians. But interest and cultural heritage are not interchangeable terms).