I'm not that knowledgeable about that part of the world, but I think the surrounding countries are mostly either Eastern Orthodox Christian or Muslim.

agreed, and even more sensible would be to just think in regions. Bosporus, Black Sea and the Mediterranean are natural boundaries for the European region, the Himalayas are the natural boundaries between East/Central and South Asia, the Saharan / Arabian / Afghan and Kazakh deserts and steppes are natural boundaries of the Middle East / North African region. Whenever a civilization has tried to cross over from one of those regions into the other, big world events ensued.

The Ural mountains divide Europe from Asia. It can also be argued that the division of Europe from the Mid East (East Med) is between Christianity and Islam.

I believe that this separation has more to do with the main religion in those two areas, which are very important in the context of this article.

I can't help but think that the whole distinction between Europe and Asia is based on European pride and racism. It definitely makes sense to divide them from a cultural perspective, but a geological one? Come on.