Thank you for the clarification friend, I apologize for misunderstanding you.
The idea of whether Muhammad was responsible for the incredible growth of Islam is, as I’m sure you know, a matter of historical rather than religious debate. Historians of a variety of different faiths disagree on the topic, so I would say that as of today there is no clear answer.
I’d humbly offer my own perspective though. The Qur’an, though not authentic scripture, is a beautiful work of literature for a man who lived in a pre-literate society. And though he did not see the expansion of Islam beyond the Arabian peninsula in his own lifetime, he did spread monotheism throughout that peninsula, which was almost exclusively pagan. This is something that Christian and Jewish merchants and residents of the Arabian peninsula were never able to do… or perhaps simply didn’t think enough of the nomadic bedouins to bother trying. He was also an effective governor, administrator, and general during his lifetime. All this makes him a historically remarkable man.
That’s my two cents on the matter, thank you for clarifying your earlier point