This would result in 'spirituality' being defined by the possession of those dozen qualities, which I think is arbitrary and baseless as a claim.
As someone who experiences those qualities, they are not "baseless". These are things that researchers can observe and map out across a spectrum of individuals. There is quite a lot of existing data and research that can be investigated. What is baseless, is to just dismiss it because you think that it just can't be real, despite the existing data.
Instead we need someone to set out a definition of 'spirituality' such that we can test whether any of the listed qualities is relevant to it.
These are qualities of lived experience, and you have a list of the types of categories already here, for one. And the "testing" is really as simple as this. "Does the subject exhibit any of these qualities, and to what degree?" The answer to your request has already been fulfilled.
Think of this like taking an MMPI, which is a list of 500 questions that is used to map up personality traits. It's the same thing. The qualities that define generally what is considered spirituality, are qualitatively different than other areas, and they are seen to exist in individuals, hence why such lists are compiled.
Without such a definition, the conversation has no intellectual place to stand.
Saying what research is being done is "baseless", has no intellectual place to stand.
(And greetings, before I forget!)
Likewise. I enjoy our occasional encounters like this.