C.S. Lewis, in his book "Mere Christianity," portrays the world as a place under enemy occupation. He suggests that humanity is living in a realm tainted by evil, which influences people's lives and choices. This situation reflects a struggle against forces that oppose the true nature of goodness and truth.

Lewis further explains that Christianity presents a message of hope, emphasizing that the rightful king, symbolizing Christ, has come to Earth, albeit in a humble and unnoticed manner. His arrival represents a clarion call for believers to join in a transformative effort to undermine the power of evil, likening their religious commitment to a campaign of sabotage against darkness.