Cyberyeti, on 2020-September-20, 10:27, said:
Various people are saying RIP RBG.
RIP implicitly is rooted in the Christian view of the afterlife, and thus shouldn't be used for RBG who was Jewish.
Jews believe in an afterlife, too.
But regardless, it's become an idiom, people don't necessarily mean it literally. Many atheists say "bless you" or "gesundheit" when someone around them sneezes. And RIP is just something you say when someone dies.