if no one has ever seen heaven or hell, or no one has encountered a life after death, then why do people still believe in it ?

This is a question for deeper thinkers and philosophers. Comedians also welcome lol

A question that fundamentally changes how we live our lives. Is the individual a once off occurance, are we reborn eternally, or do we get a passport to utopia for leading an exemplary life?

We will all die, arent we?