I was told by a friend many years ago that the conflict in Ireland was "not about religion". My reply was that "Perhaps, but when someone wants to make a violent statement about things, they know which church to target."
   "Causality" is a complex concept, but is some senses a remote ideological (religious) difference can be a very significant force in determining future events. (look up "remote cause", "formal cause", "final cause" and "material cause")
Donuel makes a minor point this time, even though neither side is debating theology.
   Steve is right on the mark as to the actual history of offenses by both sides. After a while, it it true that simple border fights and 'revenge' color ALL aspects of the situation. Who supports each side often ends up being political.
   The areas of Gaza and Israel are coveted by more groups than can possibly be reasonably be accommodated.