This question came up recently in a similar thread. In short, Domans and other East Othard natives like the Raen may be Elemental worshipers - whether they are aware of it or not is unclear. The Domans might even refer to the Elementals as kami if such a thing was brought up? So, I would say you definitely have enough lore backing to support this reasoning, and this elemental worship practiced by the Domans may very well be inspired by Shinto belief.
Hope this helps! ^^
Hope this helps! ^^
