Antitheism (sometimes anti-theism) is active opposition to theism. The term has had a range of applications; in secular contexts, it typically refers to direct opposition to organized religion or to the belief in any deity, while in a theistic context, it sometimes refers to opposition to a specific god or gods. ==Opposition to theism== The Oxford...
• (n.) The doctrine of antitheists.
An`ti·the'ism noun The doctrine of antitheists. -- 
antitheism The belief that there is no God.