If humans are machines executing on some medium eventually it will be possible to emulate them on some other medium. Believing otherwise requires some essentially religious convictions on the existence of the soul or similar.
The only reason to emulate human intelligence is to capture it, exploit it, and reduce the negotiating power of those who have it naturally. Anyone who wants this is not a friend of human beings
This could not be further from the truth.
Creating a new educated, competent human takes ~25 years, and significant costs and resources.
AGI can be just copy-pasted at essentially no cost. Even a robot that is mass-produced for tens of thousands of dollars is still much less expensive and takes much less time to make than a competent human.
> Creating new humans is easy
If you did a survey I suspect agreement with this statement would be rather bimodal.
My doubt has nothing to do with religion.
I believe we'll never be able to harness the amount of technology required to replicate human intelligence.