This is really for any of the writing team, but I'll say Mino for the sake of being specific.
We know that versions of afterlife are real, such as Hades from Asterion's own experiences ... if the MC were to change religions, as an example Greek and Roman gods, Hades - since we know that exists within the story --- when they die, would they then go to Hades?
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There is no simple, straightforward answer to that.
First of all, each religion and its afterlife has its own rules, and not all of them even allow someone to "convert" -- and some, in the universe of Mino Hotel, used to allow it in the past but no longer do so. That is the case of Hades, it no longer accepts new souls. That said, do keep in mind this is what Robert said, and you can safely presume that his knowledge on this matter is limited. On top of that, there is more to this decision from Hades than it can be conveyed in a cursory conversation.
Additionally, there is a sense of history to the world of Mino Hotel which has not been fully explored. We have seen a lot of the mythology, and we've seen a lot of "the people these myths were based on aren't exactly how they were portrayed" -- this extends to the religions as well. I don't intend on going anywhere too controversial, I think this could easily get stupid or bad if we focus too much on living religions, but do keep in mind that things do not translate 1 to 1 from real life to Minoh-verse, there is a lot of "things are not as they seem, things did not happen in quite the same way as it was told."