Anybody who uses a faith of PEACE which Islam is does not believe in violence of anykind, Just because wolves is sheep's clothing are hiding behind the blanket of Islam to claim there evil deeds does not mean they are doing it for Islamic purposes.
Just as a side note, Christianity wasn't always a "Faith of Peace". Just ask those who were tortured and killed during the inquisitions, during the founding of christian empires, etc... Oh wait. We can't. Because they are DEAD. Islam is one of the largest religions in the world, and yet it is only a small percentage of those who engage in terrorism, and they use Islam as an excuse to do those horrible things.