The really interesting thing about Derren Brown is that he used to be an evangelical Christian, and thought his way into rationality. In his 2006 book Tricks Of The Mind, he introduces the reader to basic rationality - "how do I know what I know?" - with the story of how he deconverted himself: he learnt about hypnotism, got into conjuring, and discovered how to perform for entertainment the tricks that psychics purport to perform for real. This interested him in the world of delusion: how people come to believe that such easily explicable tricks are real; and the circular nature of belief in the paranormal. He then realised he should apply this to his own Christianity ... and a lot of thinking and a copy of The God Delusion later (yes, Derren Brown is Richard Dawkins' fault), he was free. It's a heartwarming tale.