Because of His merciful love to save us from sin and death, Christ has accomplished our redemption on the Cross. To echo St. Both Protestants and Catholics agree in the infinite value of Christ's merits, and the fact that He alone could satisfy the wrath of God because of our sin. Now the real division arises in our views regarding salvation insofar as how the Grace of God won for us on the Cross by Jesus Christ is applied to our souls.
Grace is an unmerited gift offered to sinners for salvation.
So we agree that Christ alone is the Savior of humanity, and that grace alone saves us. Man could not possibly obligate God to grant heaven because of his own human achievements. The Protestant and Catholic believe God is glorified by His saving work in different ways. To the contrary, the Catholic believes God the Father recreates the sinner, not only forgiving their sin but transforming the sinner into a child of God, receiving the very life of God into his heart, causing the dead sinner to become spiritually reborn. We need forgiveness.