I'm afraid I must be the first to dissent here. Much as I love
Dilbert, and even the more serious parts of
The Dilbert Future (which is pretty simillar to this book), I must say I think after buying this book I have wasted my money...
Incidentally the reason for the discrepancy in the two write-ups above is that God's Debris was originally released as an ebook on dilbert.com but was so popular it was released in hardcover.
The book is very short, and could probably be read in half an hour in the bookstore, which is probably the best way to read it. Most of the arguments in the book are deeply logically flawed, and all follow from the premise of the existence of god, which is taken as read. But the main problem with the book is that Adams doesn't realise that his radical ideas have already occured to others. The book is essentially Robert Anton Wilson-ultra-lite , and Wilson is hardly the world's most original author to start with.
Read it by all means, but this is a Readers Digest version of philosophy...