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Christopher tells us in Chapter 199 that 'people believe in God because the world is very complicated and they think it is very unlikely that anything as complicated as a flying squirrel or the human eye or a brain could happen by chance. But they should think logically and if they thought logically they would see that they can only ask this question because it has already happened and they exist.'
Christopher's sense of stability and order comes from understanding science and logic - he does not feel comforted by holding on to the idea that there is a greater power controlling what we do and what will happen. In Christopher's world, if there were a greater power controlling things then he would not have the free will that he is confident he has. This endows Christopher, and each character, with their own individuality.