Why do Christians love to being up North Korea as their example of a country where people are atheists (or at least not Christians)? All that shows is that North Korea is an authoritarian dictatorship controlled by a dangerous maniac who is starving the population and stockpiling all kinds of horrible weapons.
It should not matter what the maniac's personal beliefs are-- his actions are bad, bad, bad. An atheist cool groovy dude is cool and groovy. An atheist evil maniac is an evil maniac first and foremost. North Korea would still be a hellhole if the evil maniac was a Christian.
Or would that make it alright? I guess by some people's standards, it would be just fine. You know, the Christian dictator does not have to abide by his own laws, and so forth.
How about Denmark, Iceland, Japan, Sweden? Democratic, peaceful, prosperous countries where people are not Christians (not Judeo-Abrahamic-monotheistic at all) and somehow are not starving, not being put into concentration camps and not killing each other willy-nilly. They have good educational systems, good health care and low crime rates. What does that tell us? It tells us that if North Korea was run by atheist cool groovy people, it would be Denmark.