Scripture was given to us by God through the Holy Spirit. The church's disingenuous claim on Scripture in bid to be able to control it and the interpretation of it is an abomination. It's an affront to God.
The only Scripture that the RCC uses to justify its power grab is twisted and misinterpreted to be able to try to do so.
No way Jesus would have given any men such unbridled power over the eternal destiny of their fellow men. The fact that the RCC is filled with immorality and corruption today, as it has been through out the centuries, is more than enough evidence against it to refute its claims of being established by Jesus and is the only legitimate church through which salvation can be procured.
Besides, salvation is not through a church, it's through a person.
Acts 4:12 And there is salvation in no one else, for there is no other name under heaven given among men by which we must be saved.”
As far as OSAS, it's to any church's benefit to convince its members that it's the only means to salvation and that they can't be sure of it. It keeps them coming back.
What a power grab.
"If we deliberately keep on sinning after we have received the knowledge of the truth, no sacrifice for sins is left, but only a fearful expectation of judgment and of raging fire that will consume the enemies of God. Anyone who rejected the law of Moses died without mercy on the testimony of two or three witnesses. How much more severely do you think someone deserves to be punished who has trampled the Son of God underfoot, who has treated as an unholy thing the blood of the covenant that sanctified them, and who has insulted the Spirit of grace? For we know him who said, “It is mine to avenge; I will repay,”and again, “The Lord will judge his people.” It is a dreadful thing to fall into the hands of the living God." - Hebrews 10:19-25
Ipsissima verba Scriptura, Ipsissima Vox Deus. Work out your own Salvation with fear and trembling.