If Mohammed was not actually the prophet of Allah as depicted in the Qu'ran, then how did he get so many people to believe he was?
But we've gone over this before. You'll offer some platitude about Muslims converting by the sword, despite two problems with that explanation:
1. Mohammed would have had to convince an initial group that he was a divine prophet to get started, which would surely have been impossible if he wasn't actually the prophet of Allah.
2. Islam spread just as quickly by trade, to the east, as it did to the west by the sword, and much more quickly than Christianity did, thus establishing Islam as the one true religion.