You are entirely mistaken on this. It is precisely conflicts over St. Augustine, especially the Protestants OVER reliance on him, that was the cause of the Reformation (and also the Jansenist heresy).
Again, the Catholic Church does not follow St. Augustine in our understanding of original sin, on predestination, on the necessity of faith for good works, etc. That is why Catholics and Protestants will never come to an understanding on justification. Until you understand this, you'll never get a good grasp on Catholicism, but continue incorectly thinking we believe in a parody of it coming to little more than Calvinism with a Pope, Sacraments, and Saints.