The way i like to think of this is along the lines of mathematics as usual. Because everything we observe in this universe so far adheres to mathematics except the inside of a blackhole, what happens after death also remains one of the many infinite possibilities. one possibility is that nothing happens and you are just gone gone. Another possibility is that you get reincarnated based on your karma. Another possibility is that you go to heaven or hell. Another possibility is that something entirely different happens as soon as you step outside this spacetime continuum because death takes you outside this thing for sure. There could be another infinite list of possibilities that none of the religions and none of the humans have accounted for