The true Quran teachings talk about self defense and forgiveness, not the forcing of Islam on every one ells. The extremist of Islam much like the extremist of many other religions including Christianity, and Judaism take only small parts of the book and teach it to their followers.
For example if you only read the stories of Noah, or Abraham, you would think that God was (excuse the pun) a satanical ass hole who enjoys murdering and philologically torturing people. Yet most Christians, don't see God as an evil being, Why, because their aren't to many people claiming that he is telling you to murder those who aren't of their religion anymore. (Christian extremist were once much worse then what Muslim extremist are today)
In the Quran, Mohamad allows his soldiers to rape young women, that in itself should show that it is violent! And the violence of isis and other terrerist groups, although only following a portion of the book, i mean, people, THEY POURED GASOLINE ON A MUSLUM PILOT, BURNED HIM TO DEATH AND POSTED THE VIDEO ON YOUTUBE!!!! I would conclude that as to being violent.
I have been looking at polls as well as reading quotes from the Quran and I have come to the conclusion Islam is not peaceful. It is illegal to leave Islam in 10 countries and polls show that up to 80% of the people in those countries support things such as implementing sharia law. Although most muslims would never commit violence they subscribe to a belief system that advocate violence and actively carries it out. Sources: https://www.youtube.com/watch?v=_ZiJehMXBpQ http://www.pewforum.org/2013/04/30/the-worlds-muslims-religion-politics-society-beliefs-about-sharia/