The website You Are Not So Smart does an outstanding job of explaining all sorts of cognitive errors for a lay audience in an engaging way. Last week Dave McRaney, the site’s author, released a book version called You Are Not So Smart: Why You Have Too Many Friends on Facebook, Why Your Memory Is Mostly Fiction, and 46 Other Ways You’re Deluding Yourself. I have not read the book yet, but it sounds like an excellent resource you might think of getting for that friend in your life who is not ready for direct attacks on their faith (or on their other fantastic beliefs) but who may nonetheless get a step closer to ready by learning about the psychology of fallacious reasoning.
Below the fold is the terrific trailer for the book. It is also worth passing on for purposes of illustrating mistaken thinking about purpose behind coincidences: