Does that answer your question in some way?
Not really, but a good presentation requires and deserves an answer. So here we go:
Before we move any further, what is the “spirit” or “soul” and how can we ascertain that it exist? In other words, how can we
measure it? As soon as someone will fabricate a “
soul-o-meter”, which will distinguish between non-living entities (no soul), lower level biological entities (material soul) and humans (immortal, rational soul) the concept of the “soul”
will be entertained. Up until that it remains an unsubstantiated hypothesis. Can’t be more accommodating than that.
Now, let’s consider the brain / mind. The mind is the electro-chemical activity of the brain. This cannot be disputed, because it has been verified “innumerable” times. The place of the “personality” resides in the frontal lobe. Any other tissue or organ can be substituted via a transplant or an artificial prosthesis - EXCEPT the brain. If sufficient blood-flow can be provided to keep the brain alive, the original person is still there, very much reduced in abilities, but still there. Theoretically, if the technology can be advanced enough, even the brain can be transplanted into a “firmware” environment - though for the time being it is just science-fiction.
The example of NDE’s is just an anecdotal proposition, not to be entertained. If an experimenter could replicate the proposition, it will be taken seriously.
The next problem is the question of “life”. Interestingly enough not even the biologists can agree, just WHAT is life? Are the viruses alive or not? The only coherent definition of “life” is “
complex responses to complex stimuli”, which is not particularly helpful. But there is nothing better. Moreover it does not require a carbon based existence. A silicon based would be just as fine. If biological viruses are alive, then silicon based computer viruses are also alive. They propagate themselves, create replicas of themselves, interfere with their environment - so they exhibit many of the principles of “life”.
So the problem is rather complicated. It is worth to examine it further.