Scott Adams, creator of Dilbert comics, wrote a book in 2001 called God's Debris. He calls it a "thought experiment". It sure made me think as I read through it. I found places where I could easily disagree with what I read but in other places I had to stop and question myself. It's a bit long but well worth the read. And it moves quickly.
If you read it and want to discuss it, let me know. Adams suggests that one share this "with a smart friend and then discuss it while enjoying a tasty beverage." Sounds good to me.