The Gospel of the Flying Spaghetti Monster by Bobby Henderson is a satirical book on religion.
FSMism, or Pastafarians, are followers of the Flying Spaghetti Monster, whose Noodly Appendage touches us all. The gospel encourages sharing of the gospel, but opts for peace if the subject is causing the listener to feel uncomfortable. A delicious meal of noodles and tomato sauce is encouraged as a healthy meal.
The book contains proofs from many scientists, including physicists, naturalist, and mathematicians.
It may also be worthwhile to note that the FSM heaven has a stripper factory and a beer volcano.
Recommended religious satirical and humorous reads:
Principia Discordia, Or, How I Found Goddess and What I Did to Her When I Found Her: The Magnum Opiate of Malaclypse the Younger
God, No!: Signs You May Already Be an Atheist and Other Magical Tales - Penn Jilette
Recommended atheist reads:
The God Delusion - Richard Dawkins
The Magic of Reality: How We Know What's Really True - Richard Dawkins, Dave McKean