Now that the novelty of the Pokephilia jokes has worn off, can we have a small worldbuilding thread with the new lore in mind?

What do you think the religious practices were like? Were the Regis made by early humans in some sort of Tower of Babel type of story? Is the creation myth we got just one interpretation of the same event that different cultures commented on? Can pseudolegendaries be thought of as demigods due to their divine heritage? What was the priesthood and temple to Arceus like in ancient times?