A couple of observations:
(1) I’ve never heard of the so-called “Doctrine of Lea,” and I see that neither has Google. Ask your friend what he’s talking about, and to document it from Catholic sources. Don’t assume a defensive position, and seek to refute his claims, but just gently ask questions and ask *him *to demonstrate his assertions.
(2) Similar to the above, ask your friend to document any historical claims he’s making, such as this idea that the Church “o*rdered the tongues of Christians who preached the Gospel of Jesus Christ - to be nailed to the roofs of their mouths so they could no longer spread the Gospel.”
Simply ask him how he knows that, *and if he has specific examples that he can cite from reputable sources.
(3) Your friend claims that Catholics are not Christians. Ask your friend some basic questions on this point, just to prompt him to think a bit about things from a Catholic perspective.
- How do you define “Christian”?
- Where did you get that definition and why are you able to bind other people’s consciences to it?
- Would you say that your definition is infallible, and thus all people should believe it if they are interested in truth, or is it merely your own opinion which only you yourself can rightfully be bound to?
- If your definition is infallible, what makes it so?
- If a Christian is a person who holds to certain doctrines which are essential to salvation, how do you objectively discern between essential and non-essential doctrines?
- Similar to the above, are you able to bind other people’s consciences to this list of essential doctrines, and if so, why?
- Where did Christ tell us that, in order to be a follower of His, and thus a true Christian, we should read the 27 books of the canonical New Testament, and discern the proper doctrines essential to salvation therefrom?
- If Christ didn’t tell us this, then who did?
- Most important of all: how do you know that the 27 books that make up the New Testament are canonical and inspired by the Holy Spirit? Why is Jude and 3 John inspired, for example, and what objective criteria do you use to establish this fact? Are the criteria you use truly objective, or are they sort of arbitrary, and basically assuming the canon first, and only then creating criteria for it?
I would then respond to each of his perspectives on these questions by saying “that’s interesting; and here’s what I believe as a Catholic about these things, and this is why.”
I would also recommend that you listen to this audio file:
calledtocommunion.com/2010/08/episode-14-from-presuppositional-pca-to-rome/
EDIT: Incidentally, by “bind other people’s consciences,” I mean “convincing people of good will who want to do God’s will, that thus and such truly has been revealed by God, and is something He wills for us to assent to.”