Protestant theology vs Roman Catholicism

The core disagreement centers on what justification fundamentally accomplishes and how it occurs. Protestant theology affirms that God’s salvation gift rests entirely on Christ’s completed work, received through grace and faith alone, with salvation not depending on the sinner’s good works.[1] The righteousness by which sinners gain perfect acceptance before God is Christ’s righteousness, graciously imputed to believers and received by faith alone.[2]

Roman Catholicism, by contrast, operates from a fundamentally different framework. Catholic teaching describes justification as an infused righteousness rather than an imputed one, beginning at baptism and capable of increase—or decrease, even to the point of being lost—through the believer’s own works.[2] In Catholic soteriology, justification becomes a gradual making-righteous through infused grace rather than an instantaneous declaration, with love rather than faith serving as the principle of justification.[3]

The error lies in conflating two distinct theological operations. Protestants never denied good works matter in believers’ lives—they taught that saving faith is repentant faith requiring obedience to Christ—but insisted works function as the fruit or consequence of salvation, not its root or cause.[1] Catholic theology teaches that righteous works are meritorious toward salvation, whereas Protestant theology affirms that righteous works result from and evidence a person justified by God and regenerated by the Holy Spirit.[4]

The practical consequence proves significant: One cannot coherently affirm justification by faith alone while maintaining the Catholic sacrament of penance, with its distinction between guilt and punishment and its requirement of works of satisfaction.[5] Sacramental grace, not justification, occupies the central position in Catholic conceptions of salvation,[5] making the traditions fundamentally incompatible despite contemporary ecumenical language suggesting otherwise.

[1] Nathan Busenitz and John MacArthur, Long before Luther: Tracing the Heart of the Gospel from Christ to the Reformation (Chicago, IL: Moody Publishers, 2017), 21–22.
[2] Alan Cairns, in Dictionary of Theological Terms (Belfast; Greenville, SC: Ambassador Emerald International, 2002), 421.
[3] William G. T. Shedd, A History of Christian Doctrine (Eugene, OR: Wipf and Stock Publishers, 1999), 332.
[4] Got Questions Ministries, Got Questions? Bible Questions Answered (Bellingham, WA: Faithlife, 2014–2021). [See here.]
[5] Scott M. Manetsch, “Is the Reformation Over? John Calvin, Roman Catholicism, and Contemporary Ecumenical Conversations,” Themelios (2011), 36:2:200.