And beyond the Islamic nations, even some of the West's apparently most democratic governments at best discriminate against citizens who have no belief in a god and at worst can jail them for offences dubbed blasphemy, it said.

The study, The Freethought Report 2013, was issued by the International Humanist and Ethical Union (IHEU), a global body uniting atheists, agnostics and other religious skeptics, to mark United Nations' Human Rights Day on Tuesday.

"This report shows that the overwhelming majority of countries fail to respect the rights of atheists and freethinkers although they have signed U.N agreements to treat all citizens equally," said IHEU President Sonja Eggerickx.