It's amazing the interesting things that can be done with survey data. This chart reposted at the I Love Charts tumblr (from a site called upworthy) is fascinating.
I wonder where South Korea would be on this chart – I have a sort of suspicion it would be an outlier much like the US, and for similar cultural reasons – i.e. the prevalence of evangelical strains of Christianism.
I also would be curious to see the same chart with each US state separated out and treated as separate countries with their individual state-level survey results and varying individual state-GDP figures. Would there still be outliers? Or would you find each individual state cleaving closer to the curious curve that was discovered?