'The God Delusion' is a strange rant, but this small work picks out some of Dawkins' most serious errors. The McGraths don't aim to undermine Dawkins as a populiser of science, but as a man with any semblance of real understanding about (a)theism. 'The Dawkins Delusion?' is very good - not to convince you one way or the other, but to know what the actual arguments are.