that you even say this may show how you learned to live with it because majority around you believes it and your human brain considers it suicide to go against the tribe. (Or maybe you believe it yourself)
it's trivial to prove there's no heaven or hell. Maybe as trivial as disprove flat earth.
Flat earth is very similar to religion. It's a belief. It perpetuates because people around you believe in flat earth and if you tell them how they are crazy then you will be outcast and lose friends and family. And hey spoiler alert this is the same reason you don't call religion crazy, because anywhere in the world 99% you have religious friends or family (except maybe north korea or china, then replace religion with dictator cult). Flat earthers are just unlucky because they are very small minority