Third, declare a religious state in cities and stronghold with a very high percentage of faithful. The realm in control would need very low morale or it could act like a rebellion where they try to take control of the palace.
I'm not sure what you want for this that the current Declare Religious State/Claim Region option doesn't permit.
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Timothy Collett
"The only thing you can't trade for your heart's desire...is your heart." "You are what you do. Choose again, and change." "One of these days, someone's gonna plug you, and you're going to die saying, 'What did I say? What did I say?'" ~ Miles Naismith Vorkosigan