Responding to the recent flap with the Pope, the Washington Post takes a look at atheism around the world:
There’s surprisingly little data available on the subject. But a 2012 poll by WIN/Gallup International — an international polling firm that is not associated with the D.C.-based Gallup group — asked more than 50,000 people in 40 countries whether they considered themselves “religious,” “not religious” or “convinced atheist.” Overall, the poll concluded that roughly 13 percent of global respondents identified as atheists, more than double the percentage in the U.S. The highest reported share of self-described atheists is in China: an astounding 47 percent. Faith has a complicated history in China. The state is deeply skeptical of organized religion, which it has long considered a threat to its authority.
The cited poll notes that religiosity is highest in the poorest and least educated nations.