i am a christian, and i found this book to be brilliant (with the exception of the section on memes, which i found to be pedantic)... i believe that anyone -- religious or non-religious, young or old -- should read this book... whether you agree with the conclusions Dawkins draws, these are important questions that have bearing on all of humanity, and this is a very well considered, cohesive, and enjoyable treatise on matters of origin and existence... its a bit slow at times, but on the whole i cannot recommend this highly enough...
Honestly, if you are a big audiobook connoisseur this is probably far from what you are used to hearing or might expect. It is fairly dry, yet humourous; short, yet thoughtful; but, ultimately, this is an incredibly self-aware work. I wish I could be more specific than that, but I don't want to spoil it for anyone else who might not only thoroughly enjoy this essay, but also be in on the joke.
The first time I listened to this, I did not enjoy it at all; but since I was in a hospital waiting room at the time, waiting for my appendix to burst, I decided I should give it another chance -- and I'm glad I did! I feel like I had an excuse for not giving it a fair hearing initially, so perhaps others will do the same in the future.
This is pretty academic, and unfortunately the narration really drives that home. Nevertheless, this is as good a treatise on truth as one could hope for: any more concise and it would barely scratch the surface; any longer and it becomes mired in endless examples and repetition.
This isn't for everyone, but if you're interested in a philosophical meditation on truth this should be right up your alley.