The Council of Trent describes the process of salvation from sin in the case of an adult with great minuteness (Sess. VI, v-vi).
It begins with the grace of God which touches a sinner’s heart, and calls him to repentance. This grace cannot be merited; it proceeds solely from the love and mercy of God. Man may receive or reject this inspiration of God, he may turn to God or remain in sin. Grace does not constrain man’s free will.
Thus assisted the sinner is disposed for salvation from sin; he believes in the revelation and promises of God, he fears God’s justice, hopes in his mercy, trusts that God will be merciful to him for Christ’s sake, begins to love God as the source of all justice, hates and detests his sins.
This disposition is followed by justification itself, which consists not in the mere remission of sins, but in the sanctification and renewal of the inner man by the voluntary reception of God’s grace and gifts, whence a man becomes just instead of unjust, a friend instead of a foe and so an heir according to hope of eternal life. This change happens either by reason of a perfect act of charity elicited by a well disposed sinner or by virtue of the Sacrament either of Baptism or of Penance according to the condition of the respective subject laden with sin. The Council further indicates the causes of this change. By the merit of the Most Holy Passion through the Holy Spirit, the charity of God is shed abroad in the hearts of those who are justified.
from
Salavation at
NewAdvent.org
In summary, based on the Scriptures, the Church has taught for 2,000 years that we are justified and saved by the grace and mercy of Christ through both faith and works, and not faith alone. We are no longer in a legal system of debt where God owes us (creditor/debtor). We are now in a system of grace where God rewards our works when done with faith in Christ (Father/child). This also means that we must continue to exercise our faith and works to the end of our lives in order to be saved. This is why Jesus told us to “endure to the end” to be saved. Matthew 10:22; 24:13; Mark 13:13. This is also why Saint Paul warned us that we could even lose our salvation if we did not persevere. cf. Romans 11:20-23; 1 Corinthians 9:27. This Catholic belief contradicts the novel Protestant notion of “once saved, always saved.”
Considering merely the psychological analysis of the conversion of sinners, as given by the council, it is at once evident that faith alone, whether fiduciary or dogmatic, cannot justify man (Trent, l. c., can. xii: “Si quis dixerit, fidem justificantem nihil aliud esse quam fiduciam divinae misericordiae, peccata remittentis propter Christum, vel eam fiduciam solam esse, qua justificamur, a.s.”). Since our Divine adoption and friendship with God is based on perfect love of God or charity (cf. Galatians 5:6; 1 Corinthians 13; James 2:17 sqq.), dead faith devoid of charity (fides informis) cannot possess any justifying power. Only such faith as is active in charity and good works (fides caritate formata) can justify man, and this even before the actual reception of baptism or penance, although not without a desire of the sacrament. (found
here)
Oh yeah, there is benefit for being a Catholic. First of all, we have the truth, which really isn’t found anywhere else—(haha).
Many Christians believe once “saved” they are “saved” no matter what sin they may commit (mortal or not!) We being Catholics have the Sacrament of Penance to recover the grace lost when in the state of mortal sin. Other Christians do not believe you can lose your salvation. For those who do, they do not have the Sacrament of Penace, so they must confess their sins with perfect contrition to God.
As Catholics, we know the truth of Salvation. It’s a process. Not an assurance. We hope for it. We do not believe it is faith alone that “saves” us…