Comment: No, it's that all Muslims agree on what the Quran says (they'd better!) and the Quran has over 100 passages that heartily encourage killing the apostate and the infidel.

In that sense, there is a common culture to Islam.   FGM is just an aspect of that culture in some areas of the world.

Also, male circumcision isn't the same thing as having one's clitoris scrapped of with a piece of stone, sans painkillers.