Atheism, therefore, is the absence of theistic belief. One who does not believe in the existence of a god or supernatural being is properly designated as an atheist. Atheism is sometimes defined as "the belief that there is no God of any kind," or the claim that a god cannot exist. While these are categories of atheism, they do not exhaust the meaning of atheism? and are somewhat misleading with respect to the basic nature of atheism. Atheism, in its basic form, is not a belief: it is the absence of belief. An atheist is not primarily a person who believes that a god does not exist, rather he does not believe in the existence of a god.