He also wrote the best-sellers
Everything You Never Wanted To Know About Sex But Have Been Forced To Find Out and
Well That About Wraps It Up For God, the central theme of which is the argument that because something as mindbogglingly useful as a
Babel fish evolved purely by chance,
God does
not exist.
The specifics of the theory can be found (suitably oddly enough) in "The dingo's got my baby".