Ive encountered people who are so totally blind they are unable to see any rational information that may challenge their religious beliefs. This reference summarizes in plain common sense a long list of points for debate, and even has some points that are very gentle and lead the debate through tiny steps that may help open some eyes. The app is a good read, and re-read, during those times when you are on the bus, the plane, waiting for your next appointment, and so on. I have the Dawkins boom "The God Delusion", and yes, this app is worth the extra price to supplement Dawkins.