When we ‘name’ something or define something it seems we place the something in a box … we delineate its’ outer boundaries.
For example … defining the unknowable places the unknowable inside a box … what is inside the box is the unknowable … what is outside the box is not the unknowable.
Ditto for the notion of spirituality … as I mentioned in another OP … for me spirituality is an unknown science … it defies definition … it cannot be contained in any vessel. Some will say I just defined spiritualism … so be it!
Throughout human history people have had questions … questions need answers … as a result we have a multitude of definitions for the unknowable and spirituality.