No, the terrorists are cowards, even more so are their masters. There are many types of bravery and many types of cowardice. Their type of cowardice is the fear of being seen as inferior, not the chosen of god. They fear that they might be wrong, possibly about everything. Sometimes it's ten times easier to get killed than admit that you could be wrong. It's even possible to kill others because of that fear.
Everybody has done it at one point or another. Christians attacked Muslims because they feared losing their lands to them. Christians and other religions persecute heretics because they fear that the religion will fall apart unless the unbeliever is removed and an example made. Thses people, these attack dogs, don't understand that if they have to turn violence on those who don't believe, they are negating their own righteousness.
It takes guts to really accept the possibility that you could be wrong, faith is the ability to accept that and still believe anyway. The terrorists are cowards because they cannot have faith unless anyone who disagrees with them is purged form the Earth.