Torunette I get where you are coming from about the practical side, and I am going to need to restrain myself because I have a geeky fascination with the practical origins or a lot of beliefs and I may go off on one if left unchecked.
For example, when I was a kid, it was extremely common to hear the phrase “seven years bad luck”. I was irrationally terrified of walking under ladders, breaking mirrors or opening umbrellas indoors, for example, because of it.
As an adult, I reflected upon it and realised that parents, who are busy, tired and just don’t have the mental space to go into a long explanation, can stop their children doing dangerous things that could cause injuries- like something dropping on your head from above a ladder, or injuring an eye with an open umbrella, very quickly, effectively and permanently, by breeding superstition in them.
The problem with this though, is that it is irrational.
With religious traditions though, a lot of the superstitiousness and ritual behaviours, were not planted there for practical reasons of safety or comfort, but in order for a small elite group of patriarchs to foster hierarchies to control the population using guilt, shame and fear.
So I agree with saying about the practical things ‘that’s not going to work here’, but there is the other layer that is as much, perhaps even more, influential with regard to the norms of doing things.
For example - I cannot think of any practical purpose for foot-binding or FGM.