Oh! In that case, ignore what I said. I thought you were saying he didn't/it wasn't likely he existed.No, not at all. I think there is a very high probability that he was an a historical figure. Getting to the "real goods" about that figure is near on impossible due to the mythology that grew around him.
I don't doubt Mohammed did some questionable things, but I also don't think he was a sociopath/psychopath. I'm a borderline case(borderline anti-social personality disorder), and Mohammed just doesn't fit.