Atheism = self defeating.
First may we define our terms. The word Atheism comes literally from the Greek, alpha the negative and theos [for God], therefore “negative God” or there is no God. It is not saying, “I do not think or believe there is a God”, rather it affirms the non existence of God. It affirms a negative in the absolute. Anyone who took philosophy 101 knows you cannot affirm a negative in the absolute. It is a logical contradiction. Therefore it is self defeating. It also breaks the rule of non contradiction by ascribing to itself a divine attribute while at the same time denying the existence of the Divine. Atheism not only denounces the existence of God, but by its own definition denounces the principle by which it criticizes the reality of God. To make an absolute statement in the negative is similar to saying that nowhere in the universe does there exist a flying spaghetti monster. For the atheist to make such a claim he must have unlimited knowledge of this universe. What the atheist is fundamentally saying is that he has infinite knowledge of this universe to affirm that there exist no being with infinite knowledge. It is self defeating.