At least atheists object to it being called one. I agree it isn't a religion by any normal definition. Lack of belief in the concept of a supernatural creator doesn't make for a system of belief or philosophy. A few atheists have turned this non-belief into a crusade or life purpose, though, such as Madalyn Murray O'Hair.
The religious don't seem to truly understand the atheist position; atheism is not just religion with the polarity reversed. Atheism treats religion as a non-factor; until theists understand this, they will never be addressing our actual position.