My friend Tim, gave me this book this morning and I have to say it was a most enjoyable read.
Letter from a Christian Citizen: A Response to Letter to a Christian Nation by Sam Harris is a response to Sam Harris' 'Letter to a Christian Nation'.
Douglas Wilson takes us on a chapter by chapter interaction with Harris and makes some very valid points along the way, often revealing Harris' poorly thought through atheism which he seems to claim along side moral judgements on right and wrong. On this, Wilson continually asks that Harris provide where he gets the standard of right from wrong and to what authority he looks to for morality.
Its quite a short book so I'm not going to say much about it other than go get one and read it, (It can be read in 2-3 hours), and enjoy the arguments that Wilson lays down against Harris and so builds up your understanding of Biblical truth and helps you to defend yourself against such atheistic teachings.