Muslims use the base of the abrahimic religion, that has those ancient lessons about mankind. But Mohammad was first a nice guy that did nothing wrong. But he at best only got around 10 follewers.
He then went to Medina, and went into politics. He tried to convice the jews that he is their prophet and to join him and follow him. He got rekt and thrown out of Medina, he ended up wandering the desssert, having halucinations, even trying to kill himself. Then he went full edgelord, he saw only hate, conquest and war in his eyes. He united the arab tribes, and came back with a force rekting Medina, rekting the Jewish and Christian population who he saw are plotting to take over his Arab Pensiunila.
He was a war mongerer, a terrorist, and he assianted his political oponents. His good boy attitunde changed, he was no longer the did nothing wrong guy trying to make the world better. He is the Akbar mask wearing guy that stabs you and enslaves your wife, as he gives you daughter to his men to rape and destory for NOT being muslim.
After his Death a civil war break down, as Muslims also started to expand in force, Islam united the arab tribes by wealth or by sword. The civil war was a small conflict between how Islam should be incorporated and it wasn't a thing people wanted to Negociate.
Both Groups saw mohammad as the perfect being, an conduit of sucess. But the isuee was which of Mohammad was the right Mohammad, the war mongering convert everybody to Islam, rapes, kills, destories Medina edgelord ? or the Mecca, religion of peace, be good, don't drink, wash yourselfs, pray 6 times a day Mohammad...
Today we see this split, and the real problem is that any muslims can flip between Medina Mohammad and Mecca Mohammd at ANY moment.