I think that you don’t think that there’s any meaningful difference between “spiritual” and "supernatural " then you’re missing the point.

I used to be an atheist anti-christian skeptic type that didn’t understand my partner’s beliefs at all, because why have beliefs if you know they aren’t real? sugar_in_your_tea’s above quote from Equal Rites actually fits it really well.

Your beliefs have an impact on how you act, and your acts have an impact on the world. Therefore I choose to live by a set of guiding principles and interact with the world in a way that fits what I want it to be like. The whole point is that you can only influence what you interact with, but also you never know what you’ll interact with.

That said, I think that people who claim to be able to influence the lives of others without interacting with them directly are on ego trips.

However, I also don’t think that anyone can say anything for certain, as we live in a universe driven by probability, where “spooky action at a distance” is an actual scientific phenomenon.

tl;dr: Spiritual describes how people interact with the world but supernatural describes hypothetical (meta)physical phenomena.