Book excerpt: Why is Jesus a giant? Because he was the founder of Christianity, the largest religion in the world with 2 billion adherents; because Christianity is one of the five great religions of the world, with followers in every country on the planet and a history stretching back two thousand years; because there remains great interest in the teaching of Jesus, his personality and his life. The origins of a great religion which has filled so immense a place in the history of the world must surely be of interest to everyone.