John 20:30-31 Now Jesus did many other signs in the presence of the disciples, which are not written in this book; but these are written so that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life in his name.
If a teaching is not found in Scripture, no one is obligated to believe it or follow it.
Being Holy Spirit inspired, God breathed, makes Scripture Truth. It can then reliably be used as the standard to measure all truth claims. If a truth claim doesn't agree with Scripture, it can be dismissed as false.
Catholics twist the term *sola scriptura* to mean things that it doesn't mean and they have been corrected time without count, and yet persist in repeating the same errors.
All faithful, well-informed Catholics believe that we are saved by grace, and by grace alone; the Church has always taught that, and it condemns as a heresy any idea which denies that fact.
Scripture teaches that it's by grace THROUGH FAITH IN CHRIST. FAITH is the mechanism by which salvation is attained, not sacraments.
Ephesians 2:4-9 But God, being rich in mercy, because of the great love with which he loved us, even when we were dead in our trespasses, made us alive together with Christby grace you have been savedand raised us up with him and seated us with him in the heavenly places in Christ Jesus, so that in the coming ages he might show the immeasurable riches of his grace in kindness toward us in Christ Jesus. For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, not a result of works, so that no one may boast.
Catholics can claim salvation by grace all they want, but until they agree with Scripture that it's through FAITH and not works, sacraments, or anything else they have to DO, they are not being in accord with Scripture about it.
Anything one has to do to apprehend grace, immediately puts it on the works level, something that is earned for behavior performed. It's wages due, not grace.