But it is impossible to offer any “proof” that “The soul has a specific nature, and is causally-dependent on a functioning brain.” Or to disprove it.
There is no scientifically accepted definition of the soul, merely different schools of thought. That is the realm of Philosphy.
I could simply choose another constraint. For example, a man’s wife died 9 years ago. Her “atomic being” is gone. So according to these constraints her soul is gone.
However, let’s say this past Christmas the man goes to the cemetery and puts flowers on his wife’s grave. From a physical point of view, thermodynamic work was done. He could say the cause was simple: “he was moved to do this by his wife’s soul.” We could argue that this is all merely a manifestation of his brain. He could argue that in the absence of knowledge of who his wife was, this thermodynamic work would never have occurred.
So is science incapable of proving either assumptions as correct or incorrect? And therefore equally incapable of disproving the man’s assumption in favor of ours?
We could argue the definition of the Universe. But if you use the definition of the Universe as being “everything that exists”, wouldn’t you then have to also accept that by expanding the definition, you must also accept that “science and it’s laws apply to everything that exists” is no longer valid in anything other than abstract terms as well? The science in this Universe has an empirical basis. We have certain constants that are defined only within our time-energy-matter space continuum. If you expand your definition beyond that, there is no requirement that other physical bodies in the total multiverse exhibit the same physical behavior.
We could argue that “the laws of science still apply” but the framework of science has now become so abstract, that you might as well include infinite possibilities, and so why not “the soul” as well.
The problem is not that I refuse to recognize any absolutes. The speed of light, atomic masses etc., these are all quantities which are known with absolute certainty in our physical existence. The problem is that it seems we are trying to expand science to explain things that are simply outside the realm of scientific explanation, as it exists in our Universe. So we really cannot have both. In this case there appears to be a logical constraint on science. Science is the science of our physical sphere of existence - our time space matter energy continuum - that is the only science we have. And there are questions and concepts that our science simply cannot address.
We could “define” a Mozart symphony in terms of a specific set of notes in a specific arrangement. Science cannot adequately explain what motivated Mozart to create this, or what might inspire other musicians to be inspired to play it an infinite number of different ways. Inspiration, like “soul” is an abstract entity. Would anyone deny the empirical evidence that humans are capable of an abstract level of creation we try to define by this word “inspiration”? Or that this “inspiration” can perpetuate itself far beyond the grave?
Why would we view the soul any differently?