Human beings, while unique, are a specific group with defined characteristics. That is us. This includes various limitations, inherent to our design, such as requirements to breathe, drink, eat, and sleep, that are universal. This also includes binocular vision, hearing, and our other senses. It is therefore facile to provide definitive statements about our capabilities to perceive, conceive, and receive understanding of the vast majority of factual reality, to wit, we simply can't. We aren't equipped to examine quasars in all spectra. Almost no information regarding quasars can be considered, and until we had instruments that were able to detect them, didn't conceive of them. Quasars are an infinitesimal portion of reality, and extremely energetic relative to most of it, making them highly detectable as well. This incapacity well reveals our inherent incapacity to know and understand something as mysterious as consciousness, which we - any of us humans - have no ability to detect except by the actions of conscious beings that have the ability to dynamically act. The objection that it's presumptuous to project such limitations on others is a logical fallacy that ignores the reality we are all humans, with the inherent limitations humans have.

"...Why would one make a "definitive statement".."

Because understanding depends on definition. Making definitive statements enables disproving them, and thus increasing understanding.

"There are ways to do that..."

I can make a thermonuclear device with my socks. Both these statements are equally fallacious, indicating delusions of grandeur. Either reality exists, and thus definitive statements can be made about it, which can be disproved if they are false, or nothing matters (literally, and pun intended). While it is convenient, and indeed necessary, to deceivers to make a variety of claims incapable of being disproved, and therefore without factual relevance, it is presently impossible to make statements about consciousness and it's nature that are disprovable regarding almost every aspect of it, such as what it is, where it comes from, and why we have it. This makes discussing it, in any of it's aspects, such as spiritual, rather devoid of functional purpose.

While you dismiss 'science' rather brusquely, unless you can disprove false claims you cannot demonstrate claims you make aren't false. That is science in a nutshell. That's all science actually is, a method for discerning falsity which is currently the only known way to discard provably false claims from those that remain potentially true.

I respectfully submit that unless you can make claims that have the potential to be falsifiable through experimental testing, your claims do not have useful potential to be true, since there is no way to establish they aren't false. Such claims don't represent knowledge, but discard knowledge and replace it with faith, which can, and has been, used to justify any and every evil that has ever been committed. Logic and reason are valuable, and it is because the scientific method is really all we have to differentiate between good and evil. Absent that method burning people alive has become a sacred ritual and for centuries caused horrific suffering. In fact, that horror continues to this day, claimed to be righteous and holy by the evil madmen inflicting that horror on their hapless victims for fun and profit.

The bulk of your statements above reflect our innate ability to use that scientific process to discard falsity without even employing conscious effort to do so, and also that we aren't even aware we do this for the most part. Again, I want to stress that what I am saying does not invalidate anyone's beliefs. People that claim they can make thermonuclear bombs from their underwear could be telling the truth, but they are not telling it in a way that is falsifiable, so it cannot be ascertained if they are telling the truth or not. What people have faith in, how they arrive at that faith, and how they express it are almost never communicated in a falsifiable way, so the common practice of Atheists to proclaim there is no God and all belief in God is stupidity is the very height of stupidity, because more than any claim of spirituality, any claim of spirituality being impossible necessarily must be made falsifiably or make a mockery of Atheists' assumption of reason and fact as any basis for their claims. Humanity has need of society, and evolution has enabled us to go along with almost any cultural practice as true believers in order to potentiate society, and our survival.

Note that I do not anywhere seek proof of anything. This is because proof cannot exist. Only disproof is possible to us, and that is all I have myself undertaken regarding my capacity, and the capacity of humanity, to judge such matters. It just isn't potential to us. It's above our pay grade. We are lucky to be able to tie our shoes, and that's as true for physicists as it is for shepherds.