Ignorant? Or willfully delusional?<quoted text>
There is no original ancient works from Homer, Plato, Caesar or Aristotle either yet the copies we have of their works show what the their original works were. For the NT, its even better.
The earliest surviving copies of any of the books of the NT are from centuries after they were written. And of all the surviving copies and fragments, virtually no two agree word for word with each other. AT BEST, there errors are mere copy errors or misspellings, but sometimes, there is serious disagreement with doctrinal text.
The earliest copies of Mark end at 16:8, everything after that was added later...