The beauty of our Christian story, especially the Bethlehem event, wowed Chesterton. He went from being a hardened unbeliever to being a sold-out believer due to the sheer beauty of Jesus.
G. K. grew up in an irreligious home. Raised by unbelieving parents, he was brought up on fairy tales, myths, and legends. His formative years were filled with wonder. His unbelief never offered him an adequate explanation for the world's marvels. To Chesterton, the whole creation was magic. When he met Jesus, Chesterton said he met the Magician.
G. K. always felt something personal was in the world, like a work of intentional artistry. For instance, he all along believed lovely red roses had to have been planned. When he met Jesus, Chesterton said he met the Artist.