Very interesting points Plum
Here is another weird scenario....
Imagine for some very strange reason, mankind knew for a certain fact, that to go through into the afterlife and live a fantastic everlasting life, after your time here on earth is up, you needed to inherently be a good person whilst you were here on earth....... I wonder how much that would change how each person interacts with each other, irrespective of religion, race, sex etc etc....
If a person knew without any shadow of a doubt, that their actions now on earth could completely derail their chances of living a phenomenal new life in the afterlife, after they die...... surely they would behave differently...... I would like to think.
Obviously as it stands now, there is no concrete proof of anything after death, hence all the uncertainty about anything.
But, having said that, humans beings are a funny breed..... you could be faced with the death penalty for certain crimes now, and that still does not necessarily deter certain people from committing these horrible crimes, but then again, the local town policeman would not really be that "ever knowing" big eye in the sky, whoever it may be.
Ag..... just more food for thought really..... we know nothing at all compared to what exists around us..