I was watching an old video clip from Gary Habermas today on Textual Criticism and he stated that in the 70s a great % of Seminary profs didn't believe in the bodily resurrection or Christ being God in the flesh. He says now the tide has changed and the greater % now believes. I've heard RC Sproul state a similar claim about Seminary educators. My question is when did this trend start concerning so many profs being liberal an unbelieving? Were the Seminary's back in the 1800s Orthodox, if so how did this infusion of liberal educators happen? Is there a good book on the subject?