>>803
Disclaimer: I have not studied history in many, many years. Furthermore, as per the demand, I have not looked at Wikipedia or anything like that. Here goes nothing.

During the Middle Ages, Western Europe was almost entirely Christian, whilst the Middle East was mostly Muslim. There was probably a smattering of Judaism in Eastern Europe as well. The crusades, a set of religiously motivated wars between Europe and the Middle East, occurred around this time (I think). There was also the endless and completely pointless conflicts in England over Catholicism and Protestantism. Thus, differences in religion caused conflicts.

In contemporary history, Europe has become more cosmopolitan, with members of many different religions coexisting. Furthermore, atheism is at an all time high, and people's attitudes to, for instance, converting from one religion to another, are extremely lenient when compared to the Middle Ages, showing that religion is not as important as it was. The Middle East is still almost entirely Muslim.

The most notable war involving Europe and the Middle East in modern times is still ongoing, so I'm not sure if it even counts as "history" yet. At any rate, the Middle Eastern side largely claims to be religiously motivated, whereas the European side has no religious aspect whatsoever.

>>805
I demand that you find your nearest living being and lick it.