A religion is a set of beliefs concerning the cause, nature, and purpose of the universe, especially when considered as the creation of a supernatural agency or agencies, usually involving devotional and ritual observances, and often containing a moral code governing the conduct of human affairs.
Atheism is not a religion, its more of a position to which proves to show that there is NO GOD. Atheist don't go to church, or bow 5 times a day to nothing (god). Disproving god goes onto disproving the holy books which i think are full of hate and terror and quite clearly the sermons of self deluded men aka prophets (jesus, muhammad, moses, etc.). As an ex-muslim i know islam is all about jihad (struggle, apparently), dying for allah, and just full form submission and refuting everything & everyone for whatever religious background they come from. All these death threats to those that apostatize from islam shows how weak, pathetic and unforgiving this stupid religion is. At least with christians and jews, i can make due with and live my life but with islam and muslims they'd want your head on a platter for blatantly proving them wrong.