Do not confuse their god (Allah), with the prophet (Mohammed). Granted, Mohammed had some significant faults, but he is not the god of their religion.
I would agree that Mohammed was a less than desirable role model, but Islam does not view him as a god either.
Don't take my word for it. It's easily ferreted out on the web.
It is from the Gospel of John, what Jesus said about the Devil. But they way Mohammed is treated in Islam, with esteem, which is pretty close to worship.
Plus also it will not be ferreted out on the internet anyways.