As @Reformed pointed out, Penal Substitution Theory was not articulated until the Reformation. I do not think the Church was void what God was revealing through Scripture the Theory for 1500 years.
What I said was that Penal Substitution was a product of the Reformation. I never said the truths it confesses did not exist before that time. I do discount the pronouncements of the Roman Catholic Church from the early 5th century until the beginning of the Reformation. The early Patristic Age left more than just the Atonement as unfinished business. It failed to tackle the importance of grace and faith, independent from an ecclesiastical hierarchy until a temperamental Benedictine monk decided to combine writing with carpentry.
I think God was very much at work during the time when the papacy ruled both religious and political life in Europe. The lamp of the Gospel was never extinguished, although it was dim to the masses. The Reformation was not an event to itself, although historians and even some in the church view it that way. The Reformation was an exodus of sorts. Just as Israel was freed from the yoke of Pharaoh, the Gospel was liberated from forces that tried to hijack it for its own purposes. The Reformers started to tackle that unfinished business that the ECF's were divided over. Part of that was the Atonement. I will save my advocacy for Penal Substitution for a thread that I will start unless someone else gets to it first. One thing that I am asking you to do is to make a strong biblical case for your position. One of the criticisms you have made about a few members of this board is that they have not made a biblical case for Penal Substitution; that they have used implied doctrine and eisegesis. Unless I am reading you wrong, you have an affinity for the writings of the ECF's and the theology that was done during the Patristic Age. That can be just as bad as an eisegetical argument because it is not an authoritative source. I cannot speak for anyone else, but I promise to give your biblical argument a serious read and honest critique.