If this were true, it wouldn't require a label, and people wouldn't feel the need to badge themselves with that label on slashdot.
Lack of evidence is hardly the only criteria for 'delusions', yet this dogmatic rhetoric belies the intention to assert your faith onto others.
If you look at the definition of religion, and the definition of atheism, its clear that atheism is not a religion.
I don't really get why your against giving a name to way people describe what they think on a given topic. It seems you'd rather everyone explain their ideas in full, even when a single word describing it would do equally well.