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This is a continuation of the article from last week where the first 4 differences were given...

Ask a serious Protestant today what is the biggest threat to orthodox Christianity today, and he might mention cultural hostilities, the sexual revolution, or nominalism in our churches. But if you would have asked a Protestant the same question a hundred years ago, he would have almost certainly mentioned the Roman Catholic Church. Until fairly recently, Protestants and Catholics in this country were, if not enemies, then certainly players on opposing teams.

Mary

According to Catholic doctrine, Mary is not only the Mother of Christ, but the Mother of the church. She was conceived without original sin (the immaculate conception) and at the end of her earthly life “was taken up body and soul into heavenly glory, and exalted by the Lord as Queen over all things” (assumption). She intercedes for the church, “continues to bring us the gifts of eternal salvation,” and is “a mother to us in the order of grace.”

Mary was more than just the faith-filled mother of Jesus: “The Blessed Virgin is invoked in the Church under the titles of Advocate, Helper, Benefactress, and Mediatrix.”

Purgatory

Catholics also teach that those who die in God’s grace, but still imperfectly purified, are assured of eternal life, but must first undergo purification in purgatory. Because of the presence of this intermediate state, the Catholic Church has developed the practice of prayer for the dead. “The Church also commends almsgiving, indulgences, and works of penance undertaken on behalf of the dead.”

Concerning the salvation of those who do not hear the gospel, the Catholic Catechism is committed to inclusivism: “Those who, through no fault of their own, do not know the Gospel of Christ or his Church, but who nevertheless seek God with a sincere heart, and, moved by grace, try in their actions to do his will as they know it through the dictates of their conscience—those too may achieve eternal salvation.”

Merit

It is not really fair to say “Catholics teach that you can earn your salvation.” That may be what many Catholics believe, but the official teaching of Rome is more nuanced, though still a long way off from the Reformation understanding sola gratia. The Catechism summarizes: “Since the initiative belongs to God in the order of grace, no one can merit the initial grace of forgiveness and justification, at the beginning of conversion. Moved by the Holy Spirit and by charity, we can then merit for ourselves and for others the graces needed for our sanctification, for the increase of grace and charity, and for the attainment of eternal life.”

Justification

Catholic teaching rejects the Protestant doctrine of imputed righteousness. The question is this: is the righteousness whereby we are forgiven and made right with God a righteousness working in us or a righteousness reckoned to our account? Catholics say the former, Protestants the latter. According to Catholic teaching, justification is more than God’s declaration of our righteousness based on Christ’s work, it is also a renewal of the inner man and reconciliation with God. Of course, these are good things too, but Catholics make them present in and through justification, rather than by faith alone.

The Council of Trent, from the 16th century Catholic counter-reformation, declares: “If anyone says, that men are justified, either by the sole imputation of the justice of Christ, or by the sole remission of sins, to the exclusion of grace and charity that is poured forth in their hearts by the Holy Ghost, and is inherent in them; or even that the grace, whereby we are justified, is only the favor of God: let him be anathema.” While individual Protestants and Catholics may work to find common ground on justification, the official teaching of the Roman Church is still opposed to any notion of an imputed righteousness through faith alone.

Conclusion

Should Catholics and Protestants treat each other decently and with respect? Of course. Will we labor side by side on important moral and social matters? Quite often. Can we find born-again Christians worshiping in Catholic churches? I’m sure. But are the disagreements between Protestants and Catholics, therefore, negligible? Hardly. The differences still exist, and they still matter.

Sanctify us by your truth, O Lord; your word is truth.

This article was originally published in 2017 and was updated in 2025.

ClearlyReformed. 8 Key Differences Between Catholics and Protestants. May 12, 2025. Kevin DeYoung

https://clearlyreformed.org/8-key-differences-between-catholics-and-protestants/