You all only think God and salvation is unknowable outside the CC. That everything must come from Rome or it’s not kosher.
Not only is this wrong, but the Catholic Church teaches the opposite of what you say here.
In addition, the CC is not “Roman”, nor does her Truth come from Rome. The Source of the Truth that is in the CC is Jesus. He was never in Rome.

Just his vicar.
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The Trinity is very present in both NT and OT. When the Father, Son and Holy Spirit are all held equally in scripture then they are.
It seems this way to you because you have already accepted the Apostolic TEaching on the Trinity when you read the Scripture. Those who reject this understand the Scripture differently.
Purgatory goes against the finished work of Christ on the cross. If he didn’t deserve purgatory NO ONE DOES! He never did anything but believe in Jesus as Savior. I’m sure you are a much better person than he was.
No, it only seems to “go against” because you have a misunderstanding of purgatory.
None of us “deserve” purgatory. It is a grace that is freely given to His beloved BECAUSE of Jesus finished work on the cross. I am not sure who the “he” is that you are referencing here, perhaps the theif? He had his purgatory on the cross next to Christ.
Since GOD authored scripture it is infallible.
No, Jericho. You have a misunderstanding about the nature of infallibility as well. Scripture cannot be infallible because falliblity requires action, and the ability to make a mistake. This is why scripture is called inspired and inerrant. Scripture is not a person.
You are right that the authorship of scripture is an infallible act. Men, moved by the HS, spoke from God. This is a good example of an infallible act. When men, moved by the HS produce a divine result, it is called infallible.
Peter made an infallible proclamation on many occasions. One of these was when the Father revealed to him who Jesus is.
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He for ordained His will apart from that of men. You see men deciding where I see God bringing His will to pass.
This is because you are not seeing the incarnational principle. You see, Scripture is clear that
men were moved by God to write, and
men met in council to determine what should be taught to the Church. God’s will for His Kingdom is not 'apart" from men, but “through” men!
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Your focus is on your church whereas my focus is on God alone.
Yes. This is one of the reasons you are suffering from a deficient gospel.