http://www.pitzer.edu/academics/faculty/zuckerman/atheism.html
"The nations with the highest degrees of organic atheism (atheism
which is not state-enforced through totalitarian regimes but
emerges naturally among free societies) include most of the nations
of Europe, as well as Canada, Australia, New Zealand and Israel.
There also exist high degrees of atheism in Japan, Vietnam, North
Korea, and Taiwan. Many former Soviet nations, such as Estonia,
Ukraine, Kazakhstan, and Belarus also contain significant levels of
atheism. Atheism is virtually non-existent in much of the world,
however, especially among the most populated nations of Africa,
South America, the Middle East, and much of Asia. High levels of
organic atheism are strongly correlated with high levels of
societal health, such as low homicide rates, low poverty rates, low
infant mortality rates, and low illiteracy rates, as well as high
levels of educational attainment, per capita income, and gender
equality. Most nations characterized by high degrees of individual
and societal security have the highest rates of organic atheism,
and conversely, nations characterized by low degrees of individual
and societal security have the lowest rates of organic atheism. In
some societies, particularly Europe, atheism is growing. However,
throughout much of the world particularly nations with high birth
rates atheism is barely discernable."