While he may believe the Jews did not take it literally (ample evidence is available they did), he'd be hard pressed to deny the same thing unless he is OK with the necessary baggage such a denial entails: the NT passages are wrong where they assume its historicity (Gal 3, Heb 11, geneology in Matthew).
As for a good resource on Mosaic authorship, also see
http://www.answersingenesis.org/crea...0/i4/moses.asp
This all goes back to the J, E, D, P documentary hypothesis.