It has nothing to do with Dilbert, but it is the same writer.
It's a relatively short, free E-book ( http://www.andrewsmcmeel.com/godsdebris/ ). Discusses science, religion, time, space, perception, society... essentially all of existence...in the form of a fictional conversation. ~144 pages.
If you've got a couple hours to kill, I'd recommend it. I read it at work yesterday - what can I say, I'm an employee of the Federal Government. Your taxes all paid me to read this, so you may as well get a reference out of it.