Views vary so widely - from those who, like fundamentalist Christians or Moslems, believe every word to be derived from Buddha (or even his actual words) to those who point to the absence of hard evidence in the form of contemporary textual records, and the near certainty of errors of memory, transcription and translation.
If we test the Pali (or even Sanskrit) scriptures for ourselves as 'Dhamma' and find that there is truth and effectiveness in them, then as I believe Buddha intended, the Dhamma is all we need, whatever its source.
In the end the issue misses the point spectacularly. It's the old 'who fired the arrow' story - never mind, just take it out.
By the way - you get 16,742 angels on a pinhead.