Realistically though this sexual predator mass murdering warlord was very clearly suffering from temporal lobe epilepsy. Everything he and his followers physically described matches the symptoms and physical actions when suffering a fit.
They fed into his delusions of grandeur and why he always had self doubt because he himself knew something wasn't right, he always asked others to reassure him that he was special. Somehow whenever he needed something to benefit him, "Allah" would reveal something in his personal favour that got him out of sticky situations with followers.

Luckily thanks to the Hadiths we have religiously authenticated accounts of all these signs and symptoms. Its probably the most documented, undiagnosed case in human history.

Part of me feels sorry for him, the other part hopes he's burning in hell for all the horror he committed in life and the demonic presence he unleashed on this world with his Arab supremacist death cult. Granted how much of the latter was his doing or his closest followers is up for debate. It's very clear that men like Umar had great influence over the warlord.