"input from Higher Powers cannot be excluded by any Wikipedia policy." See WP:SOCK.
As I'd said to begin with, I think the article shouldn't exist, as Muhammad obviously doesn't appear and couldn't have appeared in the Bible. Just framing it this way puts us in wacko land, and we then have to argue our way out of it. I don't think there is a Jesus in the Torah? Although this likewise inherently ludicrious argument has been much more elaborately developed.
I think it's all nonsense, but if someone were to create a reasonably sourced and historically significant he said-she said, I wouldn't object. It violates my idea of how to present history, but could still be valid work.