It would take a very low standard of evidence to believe that. It is indeed an area of historical mystery. For Mormons it does not impact our reverence of the NT as we have modern revelation that confirms the NT. We don't share many false traditions regarding scriptures such as inerrancy. Such traditions tend to distort the views of scholars regarding the NT.
It is indeed an area of historical mystery.
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It is not, that is a fallacy that those who promote distrust of the Bible use.
For starters, read the books I listed then, if you wish, I can give you some more works on the process and history but start with the basics.