The best argument that a Catholic can present to a Protestant is the argument of a redeemed life.
Yes, we need to know intellectually that all the ducks are in a row and that we are in the True Church of Jesus Christ. Yes, there are plenty of apologies that can be used to support the truth that the Catholic Church is Jesus’s Church, the Church He established on this earth.
But on a practical level, it really doesn’t matter if all the theology lines up. What everyone is looking for is whether the theology makes a visible DIFFERENCE in a person’s life? Is the person “better” as a result of their “correct” Church?
Mother Teresa never, to my knowledge, was involved in verbal apologetics debate with any Protestant. Yet she persuaded many Protestants, including Protestant teachers like Chuck Colson (RIP), of the validity of the Catholic Church. Colson never (to my knowledge) became Catholic, but in his book, Being the Body, he argued passionately in favor of Catholicism and pleaded for Protestants and Catholics to get back together. His description of Pope John Paul II’s involvement with the fall of European Communism was the best that I have read (I’m sure that the scholarly treatises are better, but I’m not a history scholar).
Being the Body was one of the factors that caused me to convert to Catholicism.
Many Protestants stay with their ecclesial communities because they know and trust the people, and they see a lot of simple goodness, love, and generosity in the Protestant world.
I’m going to say something that is hard for Catholics to hear–often, the reason why Protestants refuse to even listen to Catholic apologetics is because they know too many Catholics who are mired down in sin, visible sin, and don’t seem to have any interest in being “good.”
I remember my parents talking about the Catholics who would go to Mass on Saturday evening, and then go out afterwards to bars and parties and get drunk.
To many Protestants, getting drunk, or even drinking alcohol, is utterly unacceptable. This is changing, and nowadays, we see plenty of Evangelical Protestants who will enjoy a beer or a glass of wine. But there are still a LOT of Protestants who find any kind of drinking “sinful.”
Alcohol use by Catholics was the biggest barrier to my becoming Catholic. I am still bothered by it after nearly nine years in the Church.
But it’s not just alcohol. A lot of Catholics “shack up” and make no apologies for it. This is a visible sin, and when a Protestant sees this, they will not listen to apologies in support of Catholicism. What they SEE tells them that Catholicism “doesn’t work.”
Of course Protestants sin, often mightily. But that doesn’t excuse Catholics for continuing to practice a lifestyle of sin while at the same time claiming to be Christians. Many Protestants will not accept this. To Protestants, especially Evangelical Protestants, if someone is a Christian, they have turned their back on sin and they’re striving to be righteous through Jesus Christ. When Protestants see someone continuing to live in sin and actually flaunt it, but then go to Mass–this is a deal-breaker. They won’t even listen.
BUT…when Protestants see Catholics who live a good, decent, moral, humble, loving lifestyle, and who continuously give the glory to the Lord Jesus Christ–that’s a deal-maker.
I hope this post has been helpful to those wondering how to “debate” Protestants. Yes, be ready to give an anwer, but even more importantly, be ready to live the Life.