Do you care to discuss that? If so, please give us the definition of religion that you are using. The closest definitions that I could find that might be useful to you are these:I personally think atheism is a religion
 "a set of beliefs concerning the cause, nature, and purpose of the universe, especially 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."
If you ignore the part beginning with "especially," you could include science and secular humanism as religions, but not atheism.
 "a specific fundamental set of beliefs and practices generally agreed upon by a number of persons or sects: the Christian religion; the Buddhist religion."
Atheism is not a set of beliefs, but one single belief, namely, hat nobody has provided compelling evidence or argument supporting a god belief. If you hold that belief, you are an atheist. All other beliefs an atheist holds should be called something else. For example, if you believe that life evolved on earth, then you are an atheist who accepts evolutionary science. Such acceptance is neither necessary nor sufficient to identify an atheist. Some theists believe that.
And there are no practices associated with atheism.
Nor does there need to be agreement between atheists on any matter at all. If there were only one unbeliever in the world, s/he would still be an atheist.
 "a pursuit or interest to which someone ascribes supreme importance.'consumerism is the new religion' "
Even this overly broad, metaphorical definition of religion doesn't include atheism. My anti-theism might be defined that way. I consider the diminution of the Christian church's cultural hegemony (i.e.its dominant influence) to be a high priority, but that also doesn't define atheism. Muslims probably want that as well.
So please tell us which definition of religion you are using so that we can discuss whether atheism does or does not conform to it. I think that if you give the matter some thought with an open mind, you'll see that you are incorrect.