Having investigated this issue previously, I actually would argue that it is questionable whether Muhammad even existed as an historical figure.
And even if he did exist, he was meant to be illiterate.
For me, Islam is a total man-made invention and a false religion - although it does still have some truth in it which is enough to deceive people.
I think the Quran can be clearly shown to be drawing/ and prolifically plagiarising from numerous prevalent sources - Hindu myths, Jewish Midrash tales, Zorastrian writings and Gnostics gospels such as Barnabas (which is virtually universally considered to be fake).
The main "proof" however, is what the Quran says about Isa/ Jesus and the differences versus our bible. I do not see how any right-minded person, can consider the Quranic account of Isa/ Jesus as even remotely plausible when you consider who wrote the account, when it was written, where it was written and what evidence supports what was written. If you consider the biblical accounts along the same lines (who, when, where etc etc) you'd have to be very optimistic to think that the Islamic account is anything other than something lifted from one of the aforementioned Gnostic gospels.
"M" probably lived why would there be doubt?
Here is the thing to consider, does Isis/Isil represent him and his way/teaching/example?
Is there anything to say that they do not?
Was it forced conversion from day one?
Btw I know zero about Islam, just the name turns me off.
Sure you can meet briefly muslims who are polite and friendly,
what is so remarkable about that.
Germany in the thirties, German Jewry had nice friendly nieghbours too,
but it was an about turn suddenly, and they informed on them,
and did not want anything to do with them.
Point being, a whole people can turn overnight more or less,
specially with gangs of SA on the streets.
Of course the SA were gotten rid of in the night of the long knives,
they had done their part.
Back to the post so as not to wander too much.
Are Isis/Isil the real McCoy?