Dear nolongerhome,
Interesting. So religion is: "a set of beliefs concerning the cause, nature, and purpose of the universe, esp. when considered as the creation of a superhuman agency or agencies, usually involving devotional and ritual observances, and often containing a moral code governing the conduct of human affairs". I gather you got this definition from Religion | Define Religion at Dictionary.com, where these exact words are the 1st definition under the word "religion". But if one takes the 2nd, 3rd or 6th definition, Atheism could be termed a religion. But let's just look at the 1st definition which you have given:
Clause 1: "a set of beliefs concerning the cause, nature and purpose of the universe, esp. when considered as the creation of a superhuman agency or agencies"
Atheism most certainly holds a belief concerning this first clause, albeit usually in a negative statement rather than a positive statement; a "There is not" rather than a "There is". The statement that, "In the beginning God did not create..." is just as much a belief as "In the beginning God created the heaven and the earth."
As an example, the cosmologist Stephen Hawking, a man highly respected among atheists (yet he has never come out and stated whether or not he is in fact an atheist, although his ex-wife maintains that he is), in his book The Grand Design maintains that the universe came from nothing and that God did not create the universe.
Hawking declares in the same book that the laws of physics "created" the universe; who could deny that the laws of physics are not a "superhuman agency or agencies"? Many other atheists maintain the eternality of the universe itself, or else that the creation of the universe is inevitable from the inner workings of its own purely natural, impersonal "self" (i.e. Hawking's just-mentioned belief). Likewise, who could deny that the universe itself is not a "superhuman agency or agencies"? In this sense atheism is a throw-back to the days of Aristotle, great arguer for the eternality of the universe, and the ancient Greeks who believed their gods and goddesses to be expressions of the natural forces of the cosmos. A kind of Pantheism in disguise.
Clause 2: "usually involving devotional and ritual observances"
Atheism also holds such observances, albeit observances more negative, more decentralized and anti-clerical, and more seemingly private, personal, even isolationist. Some time ago I witnessed a whole slew of YouTube videos (starting as The Blasphemy Challenge by The Rational Response Squad) where atheists posted videos of themselves reciting the ritual devotional: "I deny the Holy Spirit."
Clause 3: "often containing a moral code governing the conduct of human affairs"
If one watches the "The Root of All Evil?" documentaries made by atheist Richard Dawkins on how religion (supernatural religion that is) is evil, harmful to society, and, in the words of another famous atheist Christopher Hitchens, "religion poisons everything", one can see atheists striving to present an anti-religion moral code to govern the conduct of human affairs.
Atheism can thus provide conclusive examples of all three clauses of the 1st definition of religion. Examples being very important in a belief that doesn't really possess an orthodoxy like an Apostles' Creed or a Westminster Confession, except perhaps the simple statement: "There is no God, and the supernatural does not exist." Reminds one of the Islamic Shahada or Kalimah: "There is no God but God, and Muhammad is his messenger."
There is still a problem, even with these examples. People are united in a religion by a common belief system, common rituals and rites of passage, common institutions (e.g. the Church), and various other commonalities. All Atheists have only one thing in common: a belief that there are no gods. They don't share common rituals or institutions, since only some Atheists engage in the apparently 'religious' behaviours you highlight above. What's more, their belief system (Atheism) does not mandate that they participate in any of these 'rituals' or institutions. Religions usually mandate that their followers engage in this or that behaviour if they are to accepted into the religious community.
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