Forgive me if I go a little off subject.
I would propose that you ask yourself what it is you are trying to accomplish with such a dialogue with this Baptist friend.
Are you aiming to convert him into a Catholic?
If yes, do the bishops and pope recommend that we undertake to convert Baptists into Catholics?
Are aiming to show that your religion is better than his religion? Is this a case of what St. Augustine called "libido dominandi," the will to dominate? The will to dominate is a natural impulse in all human beings. It is not something supernatural or holy at all. This impulse is what drives the worlds of Capitalism., Professional and Collegiate Sports and much of Politics.
When you wrote that you were looking for terms to "come back" with to your Baptist friend, it sounded to me like you wanted to WIN your arguments with him. The desire to WIN is "libido dominandi." As far as I can see, arguments between Catholics and non-Catholic Christians NEVER accomplish anything good, except to prepare people to be good debaters, politicians or lawyers.
Are you aiming to provide your Baptist friend with some accurate information about the Catholic Faith? If so, that seems in keeping with the pope and the bishops want us to do. Many non-Catholic have many understanding about the Catholic Faith.
At the Second Vatican Council, the Catholic bishops and popes inaugurated the new Ecumenical Movement. As I understand it, it means that Catholics are no longer to focus on converting non-Catholic Christians to Catholic Christians, but rather both sides are to learn more about each others faiths and customs, and attempt to develop a greater respect, appreciation and understanding of each other's Christian traditions and theology. I believe Blessed John Paul II stressed this over and over throughout his long term in the office of Peter. I know of no instance of any pope or bishop since the Vatican II Council trying to convert any non-Catholic Christian into becoming a Catholic. Just last week the current pope met with the Anglican Archbishop of Canterbury, and it was reported that they emphasized points of commonality and ways the Catholic Church and the Church of England could world together, prayer together, and grow most closely together. With the advent of the Catholic Ecumenical Movement (in about 1965), the old effort to convert all non-Catholic Christians into Catholics came to an end. That is my understanding. This is, I think, what any Catholic bishop will tell you. The New Evangelization launched by Blessed John Paul II is not about converting non-Catholic Christians into Catholics.
Sometimes I hear both Catholics and non-Catholic Christians talking and arguing in a way that suggested that the believe in "Salvation by Doctrine." In other words, they seem to believe that salvation and sanctification comes about as a result of holding beliefs that are 100% orthodox as defined by the Catholic Church. In past, this "Salvation by Doctrine" position does seem to have been emphasized by both Catholics and non-Catholic Christians. Both sides persecuted heretics with great ferocity. But nowadays, I believe the Catholic bishops and popes no longer take that approach. Rather, I think the emphasis nowadays on both side is on formulas that might be called "Salvation by Holiness" or "Salvation by Repentance and Faith" or "Salvation by Accepting Responses to the Graces of God," or "Salvation by Love" (love God and love neighbor, which Jesus said was the "greatest commandment"). I don't think the Catholic bishops and popes nowadays really dwell on doctrinal orthodoxy as a vital or the most important thing to achieving personal holiness. I believe the Catholic Church, in a de facto sense, recognizes that there are now and always have been "saints" among members of non-Catholic Christian communities, as well as among non-Christians and even atheists.
The Second Vatican Council said that non-Catholic Christians ALREADY are members of the one true Church. Here's a quote from that Council:
"The differences that exist in varying degrees between them and the Catholic Church-whether in doctrine and sometimes in discipline, or concerning the structure of the Church-do indeed create many **obstacles, sometimes serious ones, **to full ecclesiastical communion. **The ecumenical movement is striving to overcome these obstacles. But even in spite of them **it remains true that all who have been justified by faith in Baptism are members of Christ's body, and **have a right to be called Christian, and so are **correctly accepted as brothers by the children of the Catholic Church."
In short, your Baptist friend and your ARE members of the SAME CHURCH. You ARE BROTHERS in the one true Faith.