I did mind the nasty way Wexler referenced Christianity in Schaffer's book. It just doesn't seem to be a two-way street.
My interpretation of Wexler’s “he really believes this shit” is Jerry Wexler is saying it is just a passing phase. And truth be told Dylan has in fact oscillated a few times between Judaism and Christianity
When I see a Jew has become Christian I hope he does return to Judaism. Jerry might also have been thinking that. Wexler should not have used the word “shit”...you can substitute malarkey, jive or nonsense for that. You must remember Wexler was an atheist