There is also this thing that some fundamentalist Christians do where they claim that Christianity is NOT a religion. They talk about how Christianity is better than "The Religions".
There is also a thing that some mainstream Christians do, where they give up "Religion" for Lent. Sometimes they just mean that they are not giving up anything for Lent, sometimes they mean that they are giving up all of the negative things that are associated with religion (whatever they decide those may be).
You also have to admit, that although the lack of belief in supernatural entities or forces in clearly not a religion, there are some atheists who do have a religious devotion to their belief, and interact with groups of like-minded people in a manner that would -- to an objective outside observer -- be indistinguishable from a religious person interacting with their church, synagogue, mosque, or whatever.
