> We can't make machines that fly like birds
Not only can we, they're mere toys : https://youtu.be/gcTyJdPkDL4?t=73
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I don't know how you can believe in science and engineering, and not believe all of these:
1. Anything that already exists, the universe is able to construct, (ie. the universe fundamentally accommodates the existence of intelligent objects)
2. There is no "magic". Anything that happens ultimately follows the rules of nature, which are observable, and open to understanding and manipulation by humans.
3. While some things are astronomically (literally) difficult to achieve, that doesn't nullify #2
4. Ergo, while it might be difficult, there is fundamentally no reason to believe that the creation of an intelligent object is outside the capabilities of humans. The universe has already shown us their creation is possible.
This is different than, for instance, speculating that science will definitely allow us to live forever. There is no existence proof for such a thing.
But there is no reason to believe that we can't manipulate and harness intelligence. Maybe it won't be with Von Neumann, maybe it won't be with silicon, maybe it won't be any smarter than we are, maybe it will require just as much training as us; but with enough time, it's definitely within our reach. It's literally just science and engineering.