Given the amount of time Christ makes references to them and the scripture they produced in His ministry, the answer is, absolutely they would have. His fight was with the pharisaic apostacy all along, -- which continues in the Rabbinical Judaism of today,-- not with the Prophets.
Good points, Alex. I agree. Here is a question for you, do you think that the Pharisees of the time of Jesus actually did have, at one point, a true faith, but then lost it? OR, was their order institutional, such that perhaps generations of Pharisees (or other Jewish leaders) were all corrupt before God? I would find it odd if otherwise pious men all went to seed just because of the arrival of Jesus. That would also show me that they had no true faith in the first place.