I don't think that this necessarily plays out in practice that much though, which is why I don't think that D&D does religion particularly well. A lot about gods is filtered in play through the lens of clerics and paladins, who mostly devote themselves to a single deity. Even then, it can be lukewarm as there is not too much mechanical reinforcement of piety. Compare this, for example, with RuneQuest where using divine power requires progressing in a temple's cult and regaining divine power may likewise require that a person participates in their respective temple's cultic rituals and sacrifices.