Emerikol
Legend
You are talking about a bad DM. And yes if the player chooses to have their cleric abandon the faith knowing the consequences then it is a roleplaying opportunity. They will likely in time go to another God and start advancing there as a cleric. They may lose a level along the way if I'm DM but it can still be a great roleplaying opportunity.Fun and engaging to who? The DM who Lucy's the football out from under the player or the player who is left with a useless character because they didn't do what the DM wanted them to?
I already said a bad DM cannot be solved with rules.