If they find out the universe is a simulation then the supernatural and afterlife suddenly become a lot more plausible. This is because science is just the computer code and there is no reason why things can’t deviate from it once in a while. Living things could have separate disk images that described them so when they died they would be loaded up again. And of course there would be glitches and bugs you would be able to observe which for some people matches our world.
Of course if the universe is a simulation I would say it is one that has run a muck. But one with nonetheless a lot of beauty.