The God Delusion
This was an intense and very thought provoking read. It's anything but light and Dawkins certainly likes to pack a punch.
I imagine with this one that Dawkins is perhaps already preaching to the converted though as I think they are the only ones that would consider picking this one up.
I was not raised in a religious family but I did attend a Church of England school, looking back on it now after reading this book I can see the brainwashing in full force.
Dawkins makes numerous fantastic arguments against the existence of God and why religion is ultimately 'evil' and at times truly 'laughable'.
If you are sitting on the fence and not sure which way to go when it comes to your faith then definitely read this book.