Interesting. I have a story I’m developing where this is a plot point but it’s not just one person, it’s literally everyone. Instead of spacetime it takes place inside a machine simulation and then instead of it begins becuase of a god, it happens because everyone is immortal and bored.

But the idea is the same, for all anyone “alive” knows, they could be in the machine, except they can’t know because then they’d live wrong. Only in between lives, do they know.