If you do consider and admit that computationally there seems to be enough horsepower there, where does your skepticism come from that anybody would figure it out?
Alternatively, did you happen to completely ignore the argument about how much computation the human brain does? (Which isn't that much compared with server farms). I mean on a neural level, using the same neural network topology or an approximation of it, actual neural networks.
I guess I'm perplexed at your skepticism.
You are basing your skepticism top-down based on the results the science of artificial intelligence has shown to date.
It's a fair source of skepticism. There are 15,000+ species of just mammals, all of which have neural nets and exactly one of which have higher abstract reasoning communicated in a language with very strong innate grammatical rules - and that is humans.
However, we have 7 billion working specimens, a huge digital corpus of their cultural output, and their complete digitized source code which can be explored or modified biologically.
For me bottom-up wins. We can just try things until it works - which may be sudden/overnight.
At the moment I see a jet engine, feathers flying everywhere, and no flight. But looking at that jet engine, I just can't imagine it will take long.