Brother, let me make it clear to you that Quran does not teach us violence. It is the biggest misconception among the people around the world.
I can justify this with the verse of Quran Itself.
Holy Quran says that If someone kills another person ,unless it is in retaliation for someone else or for causing corruption in the earth , it is as if he had murdered all mankind. And if anyone saves another person, it is as if he had saved the whole of mankind. (Surat al-Ma'ida: 32)
