The world would be better without: Money? Guns? Religion? Humans?

All of the above.

Religion for sure

It's just one of those. It's religion causing all the problems. Get rid of that and the rest will be okay.

How is North Korea better in anyway lol 

Certain human race for sure

humans.  humans are the reason the world is being ruined.   if humanity will disappear, the world will fix itself and return to its former glory. we are just blocking it.

1.  healthy society cannot function without some sort of currency.

2.  guns are weapons.   if not guns, then swords, if not swords, then rocks.  weapons are essential for the survival of any thinking race, specifically for hunting.

3.  religion is another aspect of any thinking race.  the spiritual aspect of life always existed, even before us (homo-sapiens)

Hard question. If there were no humans there would not be money, guns nor religion. But I'm not sure that would not the world better. Without humans who would know if it were better or not.  Without money there would be a lot less humans. Barter only works in limited groups. Without religion man would have no compass to guide his baser instincts.  Guns are a possibility but remember prior to the gun becoming common almost all societies were ruled by some type of military elite. Remember an armed society is a polite society.

We could certainly cut back on guns. Religion is a scam. It's actually a criminal enterprise. We would all be better off without religion.

Religion.                 

Greed seems to be the human problem.