Converting to islam

I need to convert the sassanids to islam, is there a way to do this without creating a whole new religion,

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Originally Posted by satanea juda

I need to convert the sassanids to islam, is there a way to do this without creating a whole new religion,

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Replace all text references of zoroastrism to Islam.

Yeh, kind of guessed that might work but in which files???? or is it only descr beliefs