Does the Islamic world have a comparable central leadrship like the Catholic church?
Does the Catholic church cover all christains. Christains are no more centralised in their leadership than Muslims . In fact theres probably more sects of Christianity than Islam.

We get various outraged Muftis speaking in the media about these issues, but no central voice or "official word", so I get the impression that the Muslim faith doesn't have hierarchy that is as finely structured as the Catholic church....
Believe me if any Christain group did this Christains would be screaming about it. We would hunt them down ourselves. Even if you look at the IRA its other christains who are opposed to them. I fear its much the same as catholics in Ireland who dont per say back the IRA but wouldnt mind their agenda being put in place.