I doubt that a muslim would do it becuase they are a muslim anymore than I doubt a christian would do it because they are a christian.
If you want to label or tag any people who kill who happen to be muslims then you also have to do the same thing for christians surely?
So, because there are christian killers, rapists and generally *not nice* people, can we say:
This is the goal of Christians, to convert the world into a Christian world, it's in their Bible. They've been doing this for 1,500 years and they're still doing it today. There can be no exception, no deviation, no compromise. You are either for God or you are against God.
Labelling one group of fanatics as "the enemy" is all well and good, what you should do though is label "fanatics" as the enemy so whatever religion they happen to belong to becomes less relevent.
I personally find whacko-right-wing-fundamentalist-christian-gun-toting-nut-jobs much scarier than someone who just happens to be 'muslim'.