I read what Dhampy said and looked at this pictures for some calm moments.
In one hand i know that fanatical deduction of religion is the grow-bed of terrorism. It mixes with long time history of West influence in third world countries and their incitements in regimes that sometimes had toppled even national Governments, for example Mosadeq in Iran or Jacobo Arbenz in Guatemala. This is still a living thing in back of the many people in such countries although US and UK policies are changed. I think so!
So when this matter mixes with religious confrontation under the name of God or holiness things complicates and becomes a tide which few strings are from historical feud with west and couple of them are derived from the crusades.
In the other hand when i think deep in religious regulations and laws i found a justifying evident that allows people who follow to withstand against foes and even praise the ones who draw blood.
Spanish inquisitors to Saracen and Ottoman Sheiks.
Now thing is how to define enemy of God? And more important who has the authority to?
This is when exploitations of religion becomes a political pillar for regimes from ancient to present to bring up deduction that must kill and destroy. If we pay attention to these kind of leaders there's always an enemy in their speeches. Now if there was no nothing that could be exploited then these two building would be standing today!