I beg to differ. The Papacy was an important military power in 1080 due to the Investiture Controversy, if you count Matilda as Papal which we will. The mod is certainly about politics, although you will probably only see real historical parallels in 1080 and then growing less through your campaign as your rewrite history more and more. The Papacy is the main political engine of Europe and is essential for any mod that includes Europe.
I think the majority of people are happy to have another Muslim faction in the mod.