R. Crumb's upcoming "The Book of Genesis" was excerpted in The New Yorker this week. It looks amazing.
At first, he thought about doing a take-off of the story of Adam and Eve, and then a friend suggested he do the whole of Genesis. Crumb accepted the challenge, but the text seemed to him so bizarre that he quickly realized he couldn't sustain a satirical approach. He resolved to use the words of the Bible unabridged: "I did it as a straight illustration job."
UPDATE: You can see a poor-quality scan of the excerpt here.