Like it or not, Christianity has been a large influence on European/Western history and is therefore important to study how/if it changed over time and how different interpretations were used and carried into practice.

That's not at all how the peace process worked in the middle east after World War 2, they were mostly all British or French colonies and that didn't change after the peace treaties were signed.

Hell the Soviets had their army kicked out of Iran purely with diplomatic pressure, it wasn't so cut and dry as "wherever my armies are will be my puppets now"