[higgmeister]

Well, that must be why they will kill anyone who attempts to draw a picture of Mohammad.   Nobody could ever get it right.

But your theory fails a little with the schism between Sunni and Shia.   Mohammad's cousin and son-in-law, Ali caused the Shia to split from the Sunni Moslems.   That sort of implies that there was a Mohammad.   How do Holland and Spencer explain that?

[Cronos]

The explanation is that it was a standard dynastic war resulting in the Ummayyad caliphs