I don't know.  I don't use the word.  My guess is that it doesn't refer to a "thing", nor does it refer to "no thing".  It exists in a language game called "spirituality", of which "religion" is a subset.

I don't think producing physical examples acts as a definition.  You produce something, I say, "Well, I can see it, but what does the word mean?  You point at the object and say, it means that.  "But what are you pointing at?" I say.  "This!" you say.  But what is that thing you are pointing at?  What are "black", "furry", "animal" etc?  Words to be used in a language game.  As is "soul".

The fun is to flip 'em around in the game and see what comes out.  I suppose refusing to accept that a word has a meaning is to refuse to play that language game.

Elf.  Pixie.  Hey, my daughter used to be a pixie and is now an elf.  (This happens to be true, but in which language game?)

So, the first thing to say might be "The soul is or is not a physical part of the human body."  Then the discussion can be about those missing grams.

If it is not a part of the body, the conversation could be, "So, does the soul survive the death of the body?" etc.

(P.S. I felt the hexagrams 23 and 20 referenced ET.  Indeed, without imagination what is a human?  Snarfle grap urgh Wittgenstien moments...language used to point to events uncontainable by language...the quote about language being a finger and the object of language being....referent and reference and referee...enjoy yer lunch!)

Don't fight forces, use them R. Buckminster Fuller.