This is a famous but very controversial piece by Bertrand Russell. It was a lecture delivered in 1927 at National Secular Society, London. Later in 1957 it was part of a book with the same title and reached international fame. He examines one by one several highly regarded arguments for the existence (or necessity) of God. His main point however is the possibility of morality based on another principle than God. It is quite a challenging reading and one we must all face, regardless of our belief or lack of it, thereof. Enjoy!