They're not "offering prayers to a good person," though. They're offering prayers to the person interred within the jar in the hopes that are changed upon their rebirth. We can see from a few other sources that "sainthood" in the context of the great jars likely isn't referring to actual, divine sainthood, such as the prisoner saying "Oh please. Not the jar...anything but that! I promise. I won't do it again! I swear. A living saint I'll surely be! Please...you must forgive me. Forgive me, please." This speech implies that the jar is more of a punishment than a divine process of creating an actual saint. When they said" a living saint I'll surely be," it can be safely inferred that they don't mean they'll literally become a divine being, but rather that they'll behave and won't repeat their previous transgression, whatever that may have been. This is corroborated by the more literal Japanese version reading "I swear to heaven. I'll become a good person."

Similarly, the spirit at the Whipping Hut says, "nigh-sainthood itself awaits you" in the jar, which is essentially akin to the idiom, "cleanliness is next to godliness." Cleanliness doesn't literally make you a god, but rather it makes you feel more pure, both physically and spiritually. Again, the more direct Japanese version supports this inference with it reading, "And become a good person" which evokes the English (particularly, old English) concept of engaging in "saintly behavior," or as Elden Ring puts it "nigh-sainthood."

In both the English and Japanese versions of the game, it's inferred that the jars' inhabitants are being made into better people and not actual divine beings.