Ephesians 2:4-10 4But God, being rich in mercy, because of the great love with which he loved us, 5even when we were dead in our trespasses, made us alive together with Christ— by grace you have been saved— 6and raised us up with him and seated us with him in the heavenly places in Christ Jesus, 7so that in the coming ages he might show the immeasurable riches of his grace in kindness toward us in Christ Jesus. 8For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, 9 not a result of works, so that no one may boast. 10For we are his workmanship, created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them. Works follow salvation. They don't cause salvation.
That's where the confusion with works comes in for Catholics. They think they have to add works to faith in order to be saved.
God tells us that salvation is by faith and works will be the natural outworking of the saving faith that has been exercised.