The only argument that seems to be brought forward every time is "if a superintelligent being wants to do stuff, we can't do anything about it because the axiom is that superintelligence means omnipotence". This is not so different from any other religious argument since it's impossible to falsify and therefore meaningless in any scientific sense.

Superintelligence doesn't mean omnipotence. The thing is bound to physics. It's just smarter than you, to some greater or lesser (usually imagined as greater) degree.

That’s the point. They don’t need to be anything like as potent as a AGI or ASI to be an existential threat.