Here's what I believe. I believe that individual consciousness is an illusion. I believe that the only parts of our minds that are truly individual are those encompassed by the functioning of the brain, the most important of which is memory. I believe that all of the religious myths of immortality -- spirit-world survival, transmigration of souls, etc. -- are flashes of intuition coming from the fact that, on the deepest (non-individual) level, consciousness is immortal, or as immortal as the universe itself, which is the entity that is truly conscious. I believe that this reality becomes confused with personal, individual immortality as a part of the Great Illusion that divides the unity of the cosmos into a multiplicity; we are confused about who we are; who we really are is immortal; therefore many religions teach that who we THINK (erroneously) that we are is also immortal. It's not. All of which follows logically and inevitably from mystical perceptions which we both understand, but which you seem unwilling to draw the inevitable conclusions from.
That being the case, the universal consciousness is latent in everything, and emerges into manifestation to the extent that any particular system has the information-processing, learning, and feedback capacity necessary to allow it to do so. AI as it presently exists is not lacking in consciousness
per se (because that is one, everywhere, universal) but only in sophistication; it cannot manifest the same degree of consciousness as a human being, because it lacks some of the necessary information processing, learning, and feedback capacity. Should AI be developed that does not lack these things, it would be as conscious as a human being.
But even if, for whatever irrational cause, you choose to reject the idea of cosmic and unitary consciousness, you still have no basis for concluding that no AI could have a level of consciousness comparable to our own. I know that you reject the idea of the brain as the source of consciousness, so why do you have a problem with consciousness that exists without a brain?
As best I can tell, this is purely a symptom of mechanophobia. I can't see any other basis for it, and certainly you have not articulated one.