The Short Answer

Protestant objections to Catholic teaching typically cluster around a small set of recurring themes: the authority of Scripture versus Tradition, the role of Mary and the saints, the nature of justification, the papacy, and the sacraments. Each of these objections has a serious answer — not a dismissive one, but one grounded in Scripture, the witness of the early Church, and the internal logic of the Catholic theological vision. What follows is a guide to the most common objections and how to address them with both truth and charity.

The Right Approach

St. Peter’s instruction is the model: “Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have. But do this with gentleness and respect” (1 Pet 3:15). Both parts matter equally. The answer must be true; the manner must be gentle. Apologetics is not a debate competition. It is an act of charity — the sharing of truth with someone you care about, in the hope that the Holy Spirit will do what no argument can.

With that said: do not be embarrassed about defending the faith. The Catholic Church did not invent her doctrines in the Middle Ages. She received them from the apostles and has transmitted them faithfully across two thousand years. The evidence for this is abundant and accessible. Knowing it well is a form of love for those who ask.

Objection: Catholics Add to the Bible

The objection: The Catholic Bible has seven extra books that don’t belong — the Apocrypha. Catholics added them to support unbiblical doctrines like Purgatory.

The answer: Catholics did not add anything. The seven deuterocanonical books were part of the Septuagint — the Greek translation of the Old Testament used by the apostles, quoted by the New Testament authors, and included in every major canon list before the Protestant Reformation. It was the Protestant Reformers in the sixteenth century who removed them, largely because they supported doctrines Luther had already rejected. The burden of proof belongs to those who cut books out of the Bible, not to those who kept the canon the early Church defined at the Councils of Hippo (393 AD) and Carthage (397 AD). See our full article: The Deuterocanonical Books: Why the Catholic Bible Has 73 Books.

Objection: You Follow Man-Made Traditions

The objection: Jesus condemned the Pharisees for following human traditions over God’s word (Mark 7:8). Catholics do the same thing with papal decrees and Church councils.

The answer: Jesus condemned traditions that contradicted the word of God — not traditions as such. Paul explicitly commands: “Hold fast to the traditions we passed on to you, whether by word of mouth or by letter” (2 Thess 2:15). The traditions Paul is referring to are apostolic — things handed on from the apostles themselves. Catholic Tradition is not a collection of human inventions layered on Scripture. It is the living transmission of the apostolic deposit, the same faith taught by the same community from the same apostles, preserved through the same succession of bishops. The question is not whether tradition has authority — Paul says it does. The question is which tradition is apostolic. The Catholic answer is: the one preserved in unbroken continuity from the apostles to the present. See: Sacred Tradition in the New Testament.

Objection: Catholics Worship Mary

The objection: Catholics pray to Mary, build shrines to her, and call her the Queen of Heaven. That’s worship — and it’s idolatry.

The answer: The Catholic Church makes a rigorous distinction between worship (latria), which belongs to God alone, and veneration (dulia), which is the honor given to holy persons. The honor given to Mary (hyperdulia) is a higher form of veneration, but it is categorically different from worship. Catholics do not pray to Mary as to a god. They ask her to intercede with God on their behalf — exactly as they ask friends to pray for them, except that Mary, being in heaven, is more perfectly united to God than any friend on earth. This is not idolatry. It is the Communion of Saints applied to the greatest of all saints. The practice is found in the writings of Origen (232 AD) and the Sub Tuum Praesidium prayer (c. 250 AD) — the oldest known Marian prayer. It did not begin in the Middle Ages.

Objection: The Pope Isn’t in the Bible

The objection: There’s nothing in the Bible about a pope with universal authority. It’s a medieval power grab.

The answer: The Petrine texts are explicit. In Matthew 16:18–19, Jesus renames Simon as Peter (Petros — rock), says “on this rock I will build my Church,” and gives him the keys of the kingdom — the symbol of governing authority in the Davidic kingdom (cf. Is 22:22). In Luke 22:31–32, Jesus singles Peter out to “strengthen your brothers” — a leadership commission. In John 21:15–17, the risen Christ gives Peter a threefold commission to “feed my sheep.” The early Church understood Peter’s successors in Rome as bearing this primacy: Clement of Rome, writing around 96 AD, exercises authority over the Corinthian church. Irenaeus of Lyon, around 180 AD, identifies the Roman church’s tradition as the standard of orthodoxy. The papacy is not a medieval invention. It is an apostolic institution whose development is traceable from the New Testament forward. See: Peter and the Papacy: The Biblical Case.

Objection: Catholics Try to Earn Salvation

The objection: Catholics believe they earn their way to heaven through works. But Paul says we are justified by faith, not works (Eph 2:8–9).

The answer: This is the most common misrepresentation of Catholic teaching. The Church has never taught that anyone earns salvation. The Council of Trent is explicit: justification is a grace — pure gift, entirely undeserved. Catholics agree with Paul entirely that salvation is by grace through faith. The disagreement concerns the nature of justification. Protestants (following Luther) hold that justification is a forensic declaration — God declares the sinner righteous while the sinner remains internally unchanged. Catholics hold that justification involves genuine interior transformation — the sinner is actually made righteous by the infusion of grace. This is not “works righteousness.” It is a different account of what grace does. The Council of Trent anathematized anyone who says we merit initial justification — that cannot be earned. But James is equally inspired by the same Spirit as Paul: “Faith without works is dead” (Jas 2:26). A faith that produces no fruit is not saving faith. Catholics and the best Protestant exegetes agree on this. See: Sola Fide vs. James 2:24.

Objection: The Eucharist Is Symbolic

The objection: Jesus was speaking metaphorically in John 6. “This is my body” is symbolic language. No one believes in cannibalism.

The answer: Jesus uses the word trogo in John 6:54 — a graphic word meaning to gnaw or munch, not the ordinary Greek word for spiritual eating. When the disciples murmur at his teaching, Jesus does not correct them or clarify that he was speaking symbolically — he doubles down: “my flesh is true food and my blood is true drink” (Jn 6:55). Many disciples left over this teaching. If it were merely symbolic, why not correct them? The early Church took it literally without exception. Justin Martyr (c. 155 AD): “The Eucharist is not common bread… but the flesh and blood of that Jesus who was made flesh.” Ignatius of Antioch (c. 107 AD): the Docetists “abstain from the Eucharist because they do not confess that the Eucharist is the flesh of our Savior Jesus Christ.” The Real Presence is not a medieval invention. It is the unanimous teaching of the ancient Church. See: Is the Eucharist Really the Body and Blood of Christ?

Objection: Only God Can Forgive Sins

The objection: I can confess directly to God. We don’t need a priest as a middleman.

The answer: God can forgive sins directly — and does. The question is not whether God can forgive, but how Christ ordained that forgiveness be made accessible and certain. In John 20:21–23, the risen Christ breathes on the apostles and says: “Receive the Holy Spirit. If you forgive anyone’s sins, their sins are forgiven; if you do not forgive them, they are not forgiven.” This is a direct commission to exercise the ministry of forgiveness — not merely to announce it, but to bind and loose it. A forgiveness that can be withheld requires human mediation. The priest does not forgive in his own name. He forgives in persona Christi — in the person of Christ. The penitent is not confessing to the priest. He is confessing to God through the ministry Christ himself established. The result — genuine certainty of absolution — is the pastoral gift of Confession. See: Confession: Why Tell Your Sins to a Priest?

Objection: Purgatory Isn’t Biblical

The objection: Purgatory is not in the Bible. It was invented to sell indulgences.

The answer: Scripture speaks of a purifying fire that tests each person’s work after death (1 Cor 3:13–15). It speaks of a place neither heaven nor hell where Christ preached to spirits in prison (1 Pet 3:18–20). It affirms the value of praying for the dead (2 Macc 12:44–46) — a practice the New Testament neither introduces nor condemns, because it was the universal Jewish and Christian assumption. The concept of a state of final purification before the beatific vision was held by Tertullian, Origen, Cyprian, Augustine, and every Eastern liturgical tradition (which prays for the dead at every Divine Liturgy). Purgatory was not invented by the medieval Church. It was defined by the medieval Church in response to Greek objections — but it was believed long before it was formally defined. And the indulgence abuses that prompted Luther were genuine abuses condemned by the Church herself, not the doctrine itself. See: Purgatory: Biblical and Patristic Evidence.

Objection: Praying to Saints Is Necromancy

The objection: The Old Testament forbids communication with the dead (Deut 18:11). Praying to saints is the same thing.

The answer: Necromancy — consulting the dead for occult information or power — is forbidden. Asking the saints to intercede with God is categorically different. The saints are not dead in the relevant sense: “He is not the God of the dead, but of the living” (Matt 22:32). Those who die in Christ are more alive, not less. In Revelation 5:8, the elders in heaven offer “the prayers of God’s people” to the Lamb — they are interceding. The Communion of Saints — the belief that all members of Christ’s Body, living and dead, are united — means the saints in heaven can hear our prayers and offer them to God. This is not the occult. It is the logical extension of the doctrine that death does not dissolve membership in the Body of Christ. The earliest Marian prayer (Sub Tuum Praesidium, c. 250 AD) asks Mary for her intercession. The practice is ancient, universal, and theologically grounded. See: Praying for the Dead: An Ancient Christian Practice.