I, being an agnostic, do not think that the existence can be logically or philosophically demonstrated. Furthermore, I do not believe that the existence of a god is probable even, however I would never assert that it is impossible that a god could exist. That is my problem with atheism, it is just as dogmatic and insular as theism. You pronounce to know what you cannot know. A common logical fallacy which applies to almost all atheistic arguments is the argumentum ad ignorantiam, or the argument from ignorance. Because there is no evidence in favor of the existence of God, God therefore does not exist. Lack of proof is not proof. I'd like to hear some comments concerning this.