Yes, performing rituals, correctly, are often important as is sometimes flattery, cajoling. Yet, there are examples in some polytheistic cultures of deities punishing their priest/priestess by transforming him or her into monsters and/or not answering their prayers. Sometimes, the punishment has been for disrespecting the deity (even slightly) and sometimes for transgressions that were not the fault of the priest/priestess, but still offended the deity.If you look at real world polytheism, the god only cares that they get their sacrifice with the correct rituals. So long as you do that they dish out their power. They don't care what you do with it or how you act. the idea that gods care about morality and codes of behaviour is imposing a Christian idea on other religions where it does not belong. I think the baseline for D&D should be that the vast majority of religions are not pseudo-Christianity, and the gods (at least 99.9% of them) do not care how you act.
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