Where were you before you were born? I don't mean immediately before the birth process but before the person you are now was even a you. It is a lonely feeling to try to think of that space or that time. It is so removed from reality that even the realm of a ghostly apparition doesn't quite fit the situation.
Is it a reality, I mean to be a future human represented only by the possibility of some DNA coming together from two sources somewhere in time and space to form a thinking sentient being? What are the odds that "you" might not even have happened?
To get to that loneliness, you have to imagine that you have no sensations. You can't feel. You can't see. You can't smell. You can't think or even know that you aren't thinking. You have no world and maybe no beginning or end. It's a lost existence, a before-time universe.
On the other hand, there could be some good things about not being born. There would be no pain. There would be no worries, no anxiety about trying to pull your DNA from the shelf. You wouldn't concern your non-self about what is happening to the world - no climate change, no search for a good political candidate. Non-life and non-existence might be peachy.
From a scientific view, since the life process includes electrical connections and chemical processes in the brain that would not be possible after the cessation of blood flow to the head which happens in death, this non-existent frame of reference is all that is left. What with the non-proof of the spiritual being and no hard evidence of a soul, al we have remaining is a big blank. This IS the time after death just as it IS the time before birth. All the natural sciences tell us that that is what we will feel and know after death. And it amounts to nothing - or you can call it heaven if you're so inclined.
But wait, would the injustice of a murderer not getting caught require the need for an afterlife? Should life be fair? Should everything get evened out, if not in this life then in the next? The human sense of morality seems to insist on an afterlife or second chance for injustices to be rectified. Somehow we feel that the evil person should get his due. We believe that the unfortunate handicapped person should be able to be whole and complete. This social sense of fairness, however, doesn't originate from any measurable earthly compensation other than the charity of others. We will have to wait for heaven to find out if it is true.