Both are required. Faith without works is dead. Even the demons believed and they aren’t saved.
James 2:24; 26 vs. Galatians 2:16 and Romans 3:28
Both must apply because all scripture is to be used.
The works prescribed by the law referred to by St. Paul in Galatians 2:16 and Romans 3:28 are the Jewish/Mosaic laws of circumcision, dietary restriction, etc., not the ten commandments that are required(works/doers, Romans 2:13) for salvation. The Galatians and Romans Paul was speaking to were perfectly aware of this.
P.S. Martin Luther added “alone” to Roman 3:28 - it is not in the original manuscripts.
“Even the demons believed and they aren’t saved.”
What leads you to believe that demons could have the potential to be saved?
You are misreading your Bible. The Scriptures are very clear that salvation can’t be both by grace and works because grace is antithetical to works. Scripture tells us that salvation is by grace alone and works are merely the fruit of what God does in us and not the means for meriting eternal life. Grace and works simply cannot mix in any way when we consider the grounds of our justification before the Lord. If works are required, salvation becomes a reward that our Creator is obligated to give us and not a gift that is wholly unmerited by us.
“And if by grace, then is it no more of works: otherwise grace is no more grace. But if it be of works, then it is no more grace: otherwise work is no more work.”
-—Romans 11:6
“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. For we are his workmanship, created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them.”
-—Ephesians 2:8-10
“But when the goodness and loving kindness of God our Savior appeared, he saved us, not because of works done by us in righteousness, but according to his own mercy, by the washing of regeneration and renewal of the Holy Spirit, whom he poured out on us richly through Jesus Christ our Savior, so that being justified by his grace we might become heirs according to the hope of eternal life.”
-—Titus 3:4-7
Go read what Augustine had to say about Jerome’s translation.
Heck, go read about how translation works, period.
Jerome mangled the text horribly. Augustine had access to native Greek and Hebrew speakers, and had a long list of problems with the translation that became the Vulgate (and he wasn’t alone). Jerome, being Jerome, attacked Augustine.