Why would you want to call atheism a religion?
Good question. Atheism, like other "religions" is a world view. It is a system of beliefs (No God, no afterlife (all atheists believe in no form of afterlife???), no higher divine authority, only higher natural authority (human thought/Science/TV/Philosophy/Dr Phil? etc)which include a small but significant aspect on the supernatural (no God or anything supernatural exists. Just human imagination)and a set of morality relative to the individual atheist (Murphy's Law/Dont harm anybody/never vote republican/ etc?). You could theoretically call atheism a religion, a religious belief hat there is no God (a belief never proven nor disproven by scientific evidence, a priori belief).
Of course this is a bigger question than this particular blog can answer (what is the thin line between philosophy and religion (Neoplatonism/Christianity?), are all belief systems equal and in one way or another religious, why is atheism and "non-religions" put alongside eery other religion in books talking about religion, etc.
Some of these can be answered, but the whole is one gigantic philosophical question. Perhaps a new forum on this would be useful. I personally cannot promise to be on it or this for long periods of time, but i will try to write when i can. I hope you and others can talk about it on here a lot.
"The Nephilim where in the Earth in those days..." Genesis 6:4