"How would you respond to the Catholic argument that the doctrine of justification by faith alone is a fairly recent innovation?"

Dr. Haykin has responded to a question recently submitted on this website’s “Ask Me a Question” feature. The question was: “How would you respond to the Catholic argument that the doctrine of justification by faith alone is a fairly recent innovation?” Dr. Haykin responded here. Feel free to interact with his response and share your own opinions in the comment section for this post.