> 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.

> 1. Anything that already exists, the universe is able to construct

I didn't claim it is possible we couldn't build meat brains. I claimed it is possible that equivalent or better performance might only be obtainable by meats brains.

> 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.

I actually don't believe the last part. There are quite plausibly laws of nature that we can't understand. I think it's actually pretty presumptuous that we will/can eventually understand and master every law of nature.

We've already proven that we can't prove every true thing about natural numbers. I think there might well be limits on what is knowable about our universe (atleast from inside of it.)

> 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.

I didn't say that I believed that humans can't create intelligent objects. I believe we probably can and depending on how you want to define "intelligence", we already have.

What I said is that it is not a forgone conclusion that we will create "a better therapist, doctor, architect". I think it is pretty likely but not certain.