Paul warned that those who add anything to faith in Christ alone for being born again, that is anathema. Catholic Apologists are all over the map when one cites the sacraments as Catholic necessity to be among the 'going to heaven'. They even use the 'sin of presumption' to stear adherents from the joy of knowing in the here and now that their personal belief in Jesus as savior and Lord has them individually counted among the born again. Catholicism PRESUMES one cannot know they are heaven bound until they have been faithful to the sacraments! And even then at death they have been taught that their soul goes to 'purgatory' for final cleansing before Heaven is a reality for them.
The WORK that Jesus did suffering on that cross for them is then twisted to infer they must suffer in purgatory to be worthy of heaven. THUS the time in purgatory is infact works, to obtain eternal reward.
Salvation is by faith alone in Christ alone, with no works of suffering in a mythical purgatory to be clean enough for Heaven. Roman Catholicism is an anathema to Christ alone.
I’m very fond of Paul, but even the belief of what Paul says about Christ is based upon the presumption that Paul’s sinfulness did not get in the way of communicating the truth about Christ. Furthermore there is a presumption that EVEN IF Paul got some things wrong (for example, understating the importance of works as a sign that one possesses saving-faith), that God inspired other New Testament writers (such as James) who provided further perspective on the importance of the “fruits of faith” (namely works), and that this perspective was also included in the New Testament. In the end ALL orthodox Christians must assume that at least some faith-leaders down through the ages preserved the true teachings of Christ (either through their own free will OR because God himself intervened to insure that the true faith was not corrupted).