Exactly right. Muhammad was a psychopathic mass murderer.
His followers were getting restless so he went off and after awhile returned and stated he spoke to God. His "revelations" were only intended to appease (fool) his restless followers.
The Quran was not put together as a single work until 100-200 years after his death. Until that time, it was kept in his idiot followers memory.
There is nothing divine about any part of Islam.