Argument for/against the existence of God

The other day, I watched a reshowing of the Craig-Atkins debate on TV. Dr. Craig gave the typical Christian arguments for the existence of God (intelligent design, historicity of Jesus, etc.), but I was particularly interested in hearing the arguments made by Peter Atkins, who is one of the foremost advocates of atheism. I believe his main argument was something of the nature of Occam's Razor, where if you can sufficiently explain all of the things in our universe without the need for God, you should not try to explain them using God. Essentially, he was praising the greatness of science and the evolution of humanity. He believed that humans will eventually evolve into a higher form and be able to explain everything using the scientific method, even things like consciousness, ethics, and aesthetics.