I'm an anti-theist. My "belief" is that religion is a virus that should be eradicated. Why? For the simple fact it gives people reasons not to get along. It breeds fear, hatred and content for things people don't understand. Almost every religion is also a scapegoat system. Good=God did it. Bad=satan did it. Truth=you made a choice and did it yourself. Not God, not Satan, you and only you.

A theist believes in god. An agnostic has no knowledge of god. An atheist has no belief in god. (I'm an agnostic atheist.) An anti-theist believes that religion is bad and needs to go away for the good of humanity. (I'm also anti-theist.)