This thread inspired me to sign up. I’m not going to be one of those who racks up thousands, or even hundreds of posts. And, before anyone asks, Heart Foam is a reference to a Gilbert & Sullivan operetta.
What changes? Ah well. That’s a big subject. A good place to start would be to observe, as every well-informed Catholic will know, that Rome decided that the Vulgate is
more correct than the texts from which it was translated. This is why the RSV and the RSV-CE are wildly different. (I’m not endorsing or criticising the translation, just giving an example.) For Catholic approval, when there is any discrepancy, the Vulgate is preferred over the older manuscripts. So when a Catholic talks about Scripture being inspired, presumably you mean the Vulgate. There are some massive conceptual differences. Differences such as repent / do penance. The Greek
metanoia always, even in non-religious contexts, carried the sense of a change of mind or heart. English Protestant Bibles, not hamstrung by having to agree with the Vulgate, tend to translate
metanoia as “repent”. But Catholic Bibles, such as the Douay-Rheims, are translations of a translation. Luke 13:3 for example in many Bibles says - Jesus speaking - “unless you repent…”, but the Catholic Douay-Rheims that reflects the Vulgate says “unless you shall do penance”. That change from repent, meaning a change of heart and mind (and we Protestants hold to
sola fide), to do penance, meaning an act that atones for sin, fundamentally skews the Gospel to a works salvation.
So to answer the question, this change in Catholic doctrine from Biblical doctrine has great bearing on salvation. I’ll freely admit there was penance practiced in the early church, but it was hugely different from the current practice and it was done for very different reasons. This in turn has great implications for Catholic authority. If Scripture is inspired and inerrant, then was Jesus right or was Jerome? If Scripture is regarded as magisterial teaching - and I’ve seen this line taken by prominent Catholic apologists - then in principle the teaching of the magisterium is not perspicuous because even the words of Jesus Christ are subject to correction by a monk who knew better. Did Jesus say, as recorded in Matthew 4:17, “repent” or did he say “do penance”? It is absolutely constitutes a doctrinal change. There is a big theological and soteriological difference between the two.