2007, the book was the best-seller in their sales of books on religion and spirituality, with Hitchens's God is Not Great: How Religion Poisons Everything coming second. This led to a 50% growth in that category over the three years to that date. Synopsis Dawkins dedicates the book to Douglas Adams and quotes the novelist: "Isn't it enough to see that a garden is beautiful without having to believe that there are fairies at the bottom of it too?" The book contains ten chapters. The first few chapters make a case that there almost certainly is no God, while the rest discuss religion and morality. Dawkins writes that The God Delusion contains four "consciousness-raising" messages: Atheists can be happy, balanced, moral, and intellectually fulfilled. Natural selection and similar scientific theories are superior to a "God hypothesis"—the illusion of intelligent design—in explaining the living world and the cosmos. Children should not be labelled by their parents' religion. Terms like "Catholic child" or "Muslim child" should make people cringe. Atheists should be proud, not apologetic, because atheism is evidence of a healthy, independent mind. "God hypothesis" Chapter one, "A deeply religious non-believer", seeks to clarify the difference between what Dawkins terms "Einsteinian religion" and "supernatural religion". He notes that the former includes quasi-mystical and pantheistic references to God in the work of physicists like Albert Einstein and Stephen Hawking, and describes such pantheism as "sexed up atheism". Dawkins instead takes issue with the theism present in religions like Christianity, Islam, and Hinduism. The proposed existence of this interventionist God, which Dawkins calls the "God Hypothesis", becomes an important theme in the book. He maintains that the existence or non-existence of God is a scientific fact about the universe, which is discoverable in principle if not in practice. Dawkins summarises the main philosophical arguments on God's existence, singling out the argument from design for longer consideration. Dawkins concludes that evolution by natural selection can explain apparent design in nature. He writes that one of the greatest challenges to the human intellect has been to explain "how the complex, improbable design in the universe arises", and suggests that there are two competing explanations: A hypothesis involving a designer, that is, a complex being to account for the complexity that we see. A hypothesis, with supporting theories, that explains how, from simple origins and principles, something more complex can emerge. This is the basic set-up