Since it's possible to change the name of both of these I propose we change 'religion' to Culture and 'piety' to Admiration? Since M2TW can display up to 7 religions (including heretic) this would allow us to divide up the various factions into different groups who are more willing to accept one conqueror than another.
I recommended renaming piety because if you remove religion it makes no sense to have pious generals. Since piety levels are determined entirely by traits it would be easy to change how a general increases their piety, such as winning battles against enemy cultures, religions, and factions.
While this may not be the best solution, it is one possible solution.
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