"Countries with a high percentage of nonbelievers are among t..." — Greg Graffin quote meaning

Countries with a high percentage of nonbelievers are among the freest, most stable, best-educated, and healthiest nations on earth. When nations are ranked according to a human-development index, which measures such factors as life expectancy, literacy rates, and educational attainment, the five highest-ranked countries -- Norway, Sweden, Australia, Canada, and the Netherlands -- all have high degrees of nonbelief. Of the fifty countires at the bottom of the index, all are intensly religious. The nations with the highest homicide rates tend to be more religious; those with the greatest levels of gender equality are the least religious. These associations say nothing about whether atheism leads to positive social indicators or the other way around. But the idea that atheists are somehow less moral, honest, or trustworthy have been disproven by study after study.