I estimate that there is a non-zero chance that consciousness itself is something we will never truly understand. Would you ever expect a piece of software to be able to truly understand the things that drive its actual consciousness, should we ever figure out how to create truly sentient AI? I don't honestly think one could, without speaking directly to their creator. And since the existence of a creator of human consciousness is purely a thing of speculation, I don't see us ever being able to do such a thing (should they exist) until we pass through what we know as death. At that point, I feel that there's a non-zero chance that our consciousness does indeed continue on in some form of existence. What that form is, where it resides, or if it even has physical properties, I don't know, and I don't think we'll ever know, until we cross the threshold of death as individuals.

I feel that consciousness itself is something non-physical. Whether it be a specific cocktail of neurotransmitters working in concert to give us the characteristics that we attribute to sentience, or a "core" form of existence that exists outside of our physical existence, I don't know, and I don't presume to know. I also don't presume I should be going around and acting like I can say with complete authority and accuracy "X doesn't exist in any way, shape, or form, because there is no evidence". I mean, what of the many other "scientific facts" humans have revised and subsequently rejected over a few millennia?