[BurningFrog]

Pretty much all religions have some belief that the material world will come to an end. The Wikipedia article has details: https://en.wikipedia.org/wiki/Eschatology

I think religions are worldviews that appeal to universal human needs. If they all converge on some variation of Doomsday, that says something about human nature.

We atheists have to fill this need in other ways. When I was young it was nuclear war, after the Cold War it's been mostly environmental disaster. Now AI is coming up as a new candidate.

You're right that no one serious implies the literal death of every single human. A big enough disaster fills the need well enough.

This is of course just my personal speculation. I can't prove it, and have been wrong many times before.