Nobles: Ah, the military has authority over nobles
in the military . OK.
Religious "freedom" and "legal" religions: In other words, everyone has the "freedom" to share the state's approved beliefs, or else. Sounds like an analogue of George Orwell made it into this alternate reality.
Crusade: It's not the concept, but the word itself that I question. The word is derived from specific actions that probably didn't occur in the Icaran reality (although I notice Islam seems to have slipped in). The best translation to 21st Century English may indeed be "crusade", but the Icaran term itself would probably have nothing to do with Christian symbolism, i.e. a cross. As an alternative I'd suggest "Wars of Liberation", as in "The Phong Liberation" and so on.