The Atheist Experience wiki IronChariots.org has a shedload of material including arguments for and against the existence of God. Also of interest may be Matt Dillahunty's dissection of The Sermon On The Mount.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'