Religion is a convenient wrapping paper when you need to move the crowds, that's it. As the masses are by definition uneducated and uninterested morons, it's simpler to pitch geopolitical issues in terms easily understood by many rather than telling the truth. Leaving aside natural events, the only two (human) driving factors for history are influence and wealth. These are the things that trigger wars, civil wars, revolutions, migrations, etc... And this will never stop because if you can't compete for resources and influence in a civilised manner, it might be that your best rational option is to use violence. As Emil Cioran wrote "L'heure du crime ne sonne pas en même temps pour tous les peuples. Ainsi s'explique la permanence de l'histoire." which roughly translates to "Murder time does not come at the same time for all nations. This explains the continuity of history."