Testify! The problem is that Islam IS Muhammad's religion. Kind of goes like this, if you raise scorpions you will eventually get stung. Well, here is an illustration of that effect. I bet that is what would happen if there ever was a second coming of Muhammad. I doubt anyone would recognize him and then he gets to feel what its like to get shot by one of your own fanatics.
Islam will not silence everyone. Charlie Hebdo was murdered by religious cowards willing to shed blood for a faceless made up god and crazy (insane) prophet who died 1400 years ago. it was Muhammad who said "kill the unbeliever. Murder the Infidel." At least someone took the time to remember the murder of a person who spoke freely silenced by religious fanatics.