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Sweden.
About 85% of the population is non-religious - it is actually the most irreligious country in the world, beating China on a per capita basis, it is in the top ten countries for living standards, bottom ten for crime, is one of the highest paid countries in the world, and one of the healthiest.
Its population ranks highly in educational attainment.
Another example, Japan, ranks in the top ten countries for atheism in the world (Now that the cult of the emperor is over) and it is similarly highly ranked when it comes to health.
South Korea is another example of a largely atheist country that does just fine without God.
About the only really "Religious" first world country is the USA, and it is generally the worst first world country to live in - with the more religious South reflecting the gap between religious and non-religious countries.
The South has higher crime rates, higher poverty rates, higher teenage pregnancy rates, Alaska (Which is sort of the South of the North) has the highest rate of rape in America, and while America's atheist population is about 7%, only about 0.2% of America's prison population is in fact atheist.
But hey, don't let the facts get in the way of you lying for your Jesus.