Why are countries who's citizens chose atheism so much more peaceful than religious nations?

For those who insist atheists have no morals, why are Sweden & Norway so peaceful and why do they have such low crime rates? In both countries, non believers vastly outnumber believers, yet they are among the healthiest, richest and most peaceful people on Earth. Yet the USA, with it's huge number of... show more For those who insist atheists have no morals, why are Sweden & Norway so peaceful and why do they have such low crime rates?

In both countries, non believers vastly outnumber believers, yet they are among the healthiest, richest and most peaceful people on Earth.

Yet the USA, with it's huge number of fundamentalist christians, has such a high crime rate and a bit of a tendency to march off into wars for questionable reasons (Vietnam & Iraq are the first of many that spring to mind)

Deeply religious Islamic countries don't seem exactly peaceful either as a general rule. Pakistan, for example, dosn't look like the safest place to live right now, and has fought India for years over border issues.

Why does it seem that populations who's citizens CHOSE atheism (as opposed to those who have it thrust on them) are far more peaceful those who's citizens chose theism?
Update: For those who wish to disbute the statistics:
http://www.adherents.com/largecom/com_atheist.html
19 answers 19