I think that's exactly what he did. The qoran is so phony, so cobbled together from pieces of Mo's limited understanding of Jewish and Christian theology and lore that it could not have been given to him by a spirit of any kind, demonic or otherwise.
I think it is totally made up. The brilliant thing about it is that it appeals to the more bestial and savage instincts of man. Most religions try to persuade man to curb his desires and appetites. Islam encourages them as a tool of conquest. The worse you are by Western standards, the better you are by Muslim standards. And if you happen to get killed during the sanctioned raping and pillaging, you get to enjoy a paradise with 72 virgins. Islam is a brilliant recruiting tool for ignorant, savage goat-humpers.