It is relevant. New/Old Testament is not all there is to Christianity, and one/two version(s) of Quran is not all there is to Islam. If Christianity has violent elements and can coexist with Western Society, then Islam having violent elements doesn't prevent it from coexisting with Western Society either. Religions evolve, people following them, interpreting them and preaching them evolve.
It is all not set in stone, it is dynamic. If you ask, say, "Can ISIS coexist peacefully with Western Society?", then my answer will be, "No". If you ask, "Can Islam in the verse followed by Muhammad Ali coexist peacefully with Western Society?", then the answer is pretty obvious.