Crumb even uses the actual text of the Bible to narrate his illustrations--simply drawing what is in the book of Genesis renders it absurd, offensive and hilarious. That's what's so wonderfully subversive about the project.
The article quotes Mike Judge, (not of Idiocracy fame, but of the Christian Institute) who says, "If you are going to publish your own version of the Bible it must be done with a great deal of sensitivity. The Bible is a very important text to many many people and should be treated with the respect it deserves."
I'd say that Crumb has given the Old Testament the exact amount of respect it deserves.