Content Warning: This book takes a critical stance on religion, which may be provocative to some readers.

In the Preface, Dawkins addresses individuals who might be unhappy with their religious upbringing but feel uncertain about the possibility of leaving their faith. He emphasizes that atheism is a viable and fulfilling option, intending to raise awareness of this through his book. He also outlines three additional aims to raise consciousness in individuals. First, he explains the power of Darwinian natural selection, arguing that the apparent design in the natural world is better accounted for by natural selection rather than divine creation. He also addresses the ubiquity of religious belief, arguing that its widespread nature is due to sociocultural factors rather than evidence of divine truth. Additionally, Dawkins emphasizes the impact of childhood indoctrination, advocating for the idea that children should not be labeled with their parent’s religious beliefs, as they are too young to make such decisions for themselves.

Dawkins reflects on a television documentary he presented where he appreciated an advertisement that depicted a world without religion. He invites people to imagine a world free from the negative impacts of religion, citing various historical and contemporary conflicts and atrocities linked to religious beliefs.