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>>Errr... the common denominator is that people were killed. And if you're not willing to dig deeper into the events than finding a common denominator (like you're implying religion) you're never able to understand the underlying causes and effectively do something about it. And if we don't start trying to understand, we'll create another disaster like in Iraq and Syria.
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>Well, you obviously know my view. So now it's your turn - what are the underlying causes, and what can be effectively done about it?

Didn't a lot of this all start back in the Crusades? You remember those fun times, I'm sure, when the "Christian" world decided to 'save' the Holy Land from the Muslims? Which begat the Muslim crusade to 'rescue' Jerusalem from the Christians? Which begat...ad nauseum?