Tom Holland presents a BBC Television documentary in which he highlights the difficulty in finding any 7th Century extant evidence at all about the historicity of this religion.
Tom Holland asks Muslim scholar, Professor Seyeed Hossain Nasr a simple question…
“Can someone like myself, who is not a Muslim and does not believe that God spoke to Muhammad, ever hope to fathom the truth about the origins of Islam”?
Answer: “No”
The fact remains, that the claims of Islam are that when Muhammad existed, there is no evidence from that period about Islam at all. All of the evidence is circumstantial at best and likely made up at worst.