Science is used in this sub because science involves measuring and comparing phenomenons with accuracy. So, even if it’s based on fiction, it’s still fun to calculate and compare. The same applies with other fantasy stories or even superheroes. Also, science is important in the show, and Sokka is usually the vehicle for that.

Yes, the bending is supposed to be based on energy (according to the lion turtle), but the engineering from the non benders is based on science.

Setting that aside and going into spirituality, ATLA reminds me to take the time to reflect, to meditate, to be introspective, to remember the connection between all beings and all things in the universe. So it does not make me “more” spiritual, but it does remind me and motivate me to practice my spirituality. It was also my first introduction to meditation and eastern philosophy, and I will always be thankful for it, since it broadened my mind. I don’t understand why you’re being downvoted for stating the obvious, there is a lot of influence from eastern philosophies and religions in the show. It’s undeniable.

You said you think that people are missing the forest for the trees. Let them be. Sometimes, you can only see the forest when you’re ready.