Brad, in reading your post I recalled a PBS series about the brain on the Charlie Rose Show some 14 years ago.You're making flat statements about what counts as consciousness/sentience. These are open questions. You might not be wrong, but I think you should be a bit more humble about your certainty.
Where do you think human's thinking capabilities come from? Scientists are going to use a materialist framework to answer that--that thinking comes from physical processes that go on in the brain. If that's true, then it is conceivable that thinking can be manufactured in a computer. Are you on board with that analysis or do you believe that thinking originates from something else?
On a related but not exactly congruous note, do you believe humans have free will or that we are just as bound by the laws of nature and determinism as other things?
The panel of experts constantly reminded the viewers about how little we know about how our brain functions and how much is yet to be discovered. The same can be said about AI.
I have no doubt, Brad, your statement about "thinking can be manufactured in a computer" is a sure thing. On top of this, providing information required for AI to out think any human who ever existed, or could exist, is a given.