Where to start as there is so much wrong on so many levels with their central character. At least we (including most(?) Muslims in modern societies) in modern societies have evolved to reform our religious practices to 'update' or correct such ancient rites.
I don't think what you wrote would be denied by modern Muslims except by those using desperate justifications like "Yes Muhammad married Aisha when she was 9 but at that time she was mentally and physically mature."
I assume even mainstream Muslims would identify with the following criticism:
Modern criticism has concerned Muhammad's sincerity as a prophet, his morality, his marriages, his sex life, his ownership of slaves and his psychological condition.[3][12][13][14] Muhammad has also been accused of sadism and cruelty in the treatment of his enemies, including in the invasion of the Banu Qurayza tribe in Medina.
... regards Christ as something of a "hippie" figure, Muhammad is an altogether different character and one whose example "as held in Islam is universally not [that of] a pacifist," but rather one of a "conquering warlord who spread the faith by the sword."
