@Balticus
You may not have come to argue. But since you posted, it is only fair and right that you listen as some of us take this head-on.
Even if an angel from heaven--let alone the Pope, let alone Peter--should come and preach another Gospel than what Paul preached,
let him be damned!
Paul assumes that you are smart enough to read his letters and come to know what is the Gospel and what isn't. Do not hide behind "the devil knows the Scriptures too." There is a serpent in your own heart that can twist around the Scriptures just as well as he can to suit your own desires and lusts. When Peter went astray no one was supposed to throw up their hands and say, "Well we trust him." Their obligation was to disobey Peter's example. Thus are you too when any church authority gives you a Gospel which is no Gospel, and you may not hide behide any difficulties--whether pretended or real.
Do you so despise the death and obedience of Jesus Christ that now you must somehow make it better by what you do? Was His sacrifice on the cross so impotent that you need continually sacrifice Him at the Mass? If you are going to rely on your own works in any measure--church membership, baptism, charity, penance, sacraments, submission to church authorities, love, doesn't matter what it is--Christ will be of
no benefit to you. It will be all on you to bring your own righteousness and atonement before God, based exclusively on your works and death, and none of Christ's. And Paul is clear in Galatians, that has only one result--death. That is as certain as God is holy.
Dress it up in candles, paintings, cathedrals, rituals, masses, images, Latin catch-phrases, it's only the adornments of the house of the spiritually wayward woman, and "in her house are many slain." You are on your way to joining them. Do not spit upon the face of Christ by denying the absolute perfection and sufficiency of His obedience and death. Do not insult Him by trying to add your righteousness to His. If the Lord shakes you awake you'll only find that you've left your father's house with high hopes, only to be struck with a famine, and find yourself a poor man coveting the food of pigs.