Those who say there's nothing after death, aren't you a little bit puzzled by what happens to your perception of nothing? You suddenly cease to exist, how's that going to be? It's paradoxical. How can you experience non-existence? Or how can you not experience existence?
I think that paradox is the basis for any belief in a life after death.
I think it's just because people can't fathom it.
You experience "not existing" before birth simply because you do not exist in the physical world yet.
You also experience a lapse in waking consciousness while sleeping or in a coma. You might be "alive" while sleeping, but what also can occur is closing your eyes and waking up 8 hours later and the entire experience may have felt as though it only lasted for one minute.