Quite right, Dr. A. However, I hear "atheism is a belief" asserted much more often than "atheism is a religion". Don't you? I understand that it can be and is a belief for some people. But it doesn't seem that folks who say "atheism is a belief/religion" see any distinction: "Those atheists are all the same."
I think they're usually sincere in this opinion (except for some trolls who are just trying to get a rise). I think it's hard for them to imagine living life without supernatural beliefs influencing most or all aspects of it.
Although as Jon joked, it may not be the sportiest of sports!
I remember Bobby Fisher getting ready for the Reykjavik games against Boris Spassky. He was photographed horseback riding and in the article I was surprised to learn how much physical training he was doing to prepare for sitting across the board from Boris. I then read accounts of previous opponents who remarked at how Bobby would stare you down and playing against him was physically exhausting and ruined any chance of getting good sleep for the next game.
This punchline is nice because it could be adapted to the culture of the person who says "atheism is a belief/religion". If it's a Londoner, you could say, "...then not playing football is a sport", but if it's a Chicagoan, you could say, "...then not playing football is a sport".
'Qui non intelligit, aut taceat, aut discat' The mind is like a parachute. It only works when it is open.-FZ The industrial revolution, flipped a bitch on evolution.-NOFX It takes all kinds to make a mess- Benjamin Hoff