The discussion is becoming irrelevant to the topic of what happened in Paris. It doesn't matter what muslims think of their religion anymore than it mattered what Hebrews thought of their religion or christens theirs or classical religious believers thought of theirs. Europe warred on itself for century upon century upon century when it was Christian all the time. The question is why. And it wasn't because of religion. And it isn't today.
Eh, Europe had plenty of internal wars over religion. Even without religion, there'd be war. It's what humans do. But this most recent Paris attack had a lot to do with religion. Religion is the reason ISIS exists. I don't understand why we don't take their word on it.