The Islamic terrorists commit acts of terror and murder because of the texts of the Quran.
No, because of their perverse interpretations of the Qu’ran, acts which have been condemned by Moslems.
But, nevertheless, they can still be refered to as Moslems.
The Serbian Nationalist does not kill because Jesus says to kill the Austrian, Bosnian, Croat, Albanian, and all others who get in the way of a Greater Serbian State.
No one, and certainly not any of them, claims that they are killing in Christ’s name. They can still validly be referred to as Serbian Christians. No one is counting how often they go to church. Many IRA terrorists were nominally Catholics, even as their acts were not done in Christ’s name.