For example. The atheism religion has people who try to (unknowingly) set themselves up as God by proclaiming (falsely) that God doesn't exist. So, when they try to set themselves up as God, they proclaim that He exists. In addition, many of them understand certain factual science. They understand part of what God created. So, even they have some minor accuracy in their religion.
Atheism (from the greek ἄθεoς, àtheos, composed of α- privative, without, and θεός, god, literally without god) is a philosophical position opposite to theism and pantheism in general, to polytheism and monotheism in particular. So, everyone who claims that atheism is a religion simply doesn't know what he's talking about.
