By saying my comments are off topic, you indicate I have failed in my explanation.
To assist, please read the entire post, since it is easy to extract individual sentences and project them as being off topic when in actuality they are merely smaller parts of a larger whole.
Let me try to do better, with the analogy of a memory.
Where does it reside? What does it look like? How can the memory be harvested or examined?
When the body dies, where do the memories go?
How is it that all memories, despite them being so different and including things such as sound, vision, smell etc, all look the same at the physical level?
Here's where it links to the current topic.
'Spirit' is not alone in being difficult to define.
Some (and I'm not saying anyone here) may use this difficulty to refute that spirit exists, simply because it is difficult to define.
However we have personal experience of other things which are difficult to define (memories - not the causes or effects or even holding places of memories, but memories themselves) yet accept these exist.
The manifestion of spirit at pentecost 33CE was the image of tongues of fire, and the ability to speak in tongues.
This indicates that this type of spirit is a power of some sort. Maybe it is a form of power that we have not yet encountered anywhere else, and therefore struggle to describe it using the limited understanding available to us today.
Splash.