Have you read "The Blind Watchmaker"?

One of the most famous arguments of the creationist theory of the universe is the eighteenth-century theologian William Paley's: Just as a watch is too complicated and too functional to have sprung into existence by accident, so too must all living things, with their far greater complexity, be purposefully designed. But as Richard Dawkins, professor of zoology at Oxford University, demonstrates in this brilliant and eloquent riposte to the Argument from Design, the analogy is false. Natural selection, the unconscious, automatic, blind yet essentially non-random process that Darwin discovered, has no purpose in mind. If it can be said to play the role of watchmaker in nature, it is the blind watchmaker.