Logically speaking I do not follow. Why would it be the same? Why could it not be possible that different religious groups would have a different outcome "after living"? It's just as unprovable, no?
Yeah that's true. Though many (most?) religions believe their path/destination is the only true one, so believing there would be different outcomes for different groups would be a new religion those religions would vehemently disagree with. And of course that belief would be itself one of the possible final destinations of all the paths of which only one is true.