What is the disbelief in the existence of any god called?

It is not Atheism. I hate when morons want to use Words without understanding thier meanings and origins. Atheism was first used by the ancient greek and roman empires to mean a person who did not worship the accepted god's of the state, which means that christians, hindus, buddhists, muslims, jews, wiccans, and any other religion besides those worshped by the ancient greek and romans were considered Atheist. the lack of belief in any diety would be considered Agnostic, since a lack of belief means you niether see proof for or against a god's existance. If you, on the other hand, belief there is no god, to a point you will argue that there is none, then you are anti-thiestic, which is basiclt the belief that God is a lie.