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In page Religious persecution:

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Used before the 18th century as an insult,[1] atheism was punishable by death in ancient Greece as well as in the Christian and Muslim worlds during the Middle Ages.[citation needed] Today, atheism is punishable by death in 12 countries (Afghanistan, Iran, Malaysia, the Maldives, Mauritania[citation needed], Nigeria[citation needed], Pakistan, Qatar, Saudi Arabia, Somalia, Sudan and Yemen), all of them Muslim-majority, while "the overwhelming majority" of the 193 United Nations member countries "at best discriminate against citizens who have no belief in a god and at worst they can jail them for offences which are dubbed blasphemy".[2][3]