History tells us that Hippocrates, Galen, etc., were brilliant physicians. But even the dullest university-trained physician of today is light-years ahead of them. That doesn’t diminish the brilliance of the ancients. On the contrary, it glorifies God, who gave us the gift of being able to see a bit further by standing on the shoulders of giants.
We have no reason to think the same shouldn’t be true in theology. Many aspects of the so-called Faith Once Delivered remind me of the four-humours model of medicine. This model held that disease was supposedly caused by an imbalance in the body’s alleged four humours: Yellow bile; black bile; phlegm; and blood. Physicians proceeding under this model did some useful things in the name of restoring the so-called balance of humours, such as prescribing a healthy diet and exercise. But they also did harmful things such as bloodletting, the shock from which is thought to have helped to kill George Washington.
Today's physicians know a lot more, and as a result they can do a lot more good and less harm, than did their ancient predecessors. Theologians who insist on adhering strictly to the Faith Once Delivered would do well to take note.