The game only needs to distribute powers between secular and magical tech trees.
If secular magic is even confusable with divine intervention.
If secular magic even comes to exist. Toady has said very little about what he wants to do with gods and magic, but he has said he wants DF to be a generic fantasy setting generator; the last time I checked, the difference between secular magic and divine intervention, as well as arcane magic and divine magic in general, was obvious in most generic fantasy settings. Don't make any assumptions about how DF is going to turn out that aren't based in reality and direct quotes from Toady; that's just a road to arguing about hypotheticals that no one else thinks are ever going to occur and disappointment.
Anyhow, I've been reading about other people's experiences with the new edition, and have suggestions of my own related to gods and depictions of them: if a temple to a deity contains depictions of that deity (statues, engravings, figurines, items with decorations, etc), then those depictions can be used as "objects of worship" that dwarfs could interact with as part of their worship. Interacting with an object of worship would not be necessary for worshiping, but doing so would provide an extra happy thought beyond the one they get from satisfying their need for worship, and would allow them to worship more efficiently. The happiness from using an object of worship would depend on its value, while the efficiency bonus would
usually depend on the quality of the depiction; if the depiction is made from a material of special interest to the deity, then another modifier is applied as well. If a single piece of furniture contains multiple depictions, then it is only one object of worship, but one with very high worship efficiency bonuses. If the deity is depicted as an animal, then totems of that animal as well as livestock designated as sacred animals may be used as objects of worship as well, with sacred animals providing the highest prayer efficiency bonuses of any single depiction of a deity.
Some objects of worship can be used by multiple dwarfs at the same time; dwarfs who use an object of worship at the same time will always socialize positively together while doing so (though this might also be true of simply worshiping in the same temple at the same time). In this way, worshiping together would help inspire positive bonds and erase grudges, much like in real life. Dwarfs may be get upset if there is no temple to one or more of their deities, and if said temples aren't sufficiently high value. How valuable the dwarfs expect the temples to be would depend on how devoted they are to that deity. Dwarfs would also get upset if temples to their deities contain no objects of worship, and if they were forced to worship without objects of worship because there weren't enough to go around.