We are not saved by "faith working through love."
I often hear Galatians 5:6 quoted when catholics speak of salvation. That we are saved by faith working through love.
(For in Christ Jesus neither circumcision nor uncircumcision counts for anything, but only faith working through love.)
Reason 1 why this is false.
Paul, has this exact same line of thinking in the next chapter. He writes
(But far be it from me to boast except in the cross of our Lord Jesus Christ, by which the world has been crucified to me, and I to the world. For neither circumcision counts for anything, nor uncircumcision, but a new creation.) Galatians 6:14-15
Its the same sentence structure, but he replaced "faith working through love" with "a new creation."
Both of these things are describing what a Christian will do or be after having been saved, not how to get saved or maintain right standing with God.
Because we have been saved, we will be a new creation.
Because we have been saved, we will work out our faith through love.
NOT TO BE SAVED, but what will happen as a result.
Reason 2 why this is false.
Paul just said how we are not saved through the law, bit by faith in Christ.
(For freedom Christ has set us free; stand firm therefore, and do not submit again to a yoke of slavery. Look: I, Paul, say to you that if you accept circumcision, Christ will be of no advantage to you. I testify again to every man who accepts circumcision that he is obligated to keep the whole law. You are severed from Christ, you who would be justified by the law; you have fallen away from grace.) Galatians 5:1-4
The Pharisees were trying to convince the Galatians that they had to be circumcised and keep the Moaisic laws in order to be saved.
Paul said that if you accepted these teachings you would be obligated to keep the whole law if you accept circumcision.
If you make this the means of your justification rather than Christ alone, you would be severed from Christ and fallen from grace.
Paul, said this to those who would be justified by the law. 10 verses later, he defined the law.
(For the whole law is fulfilled in one word: “You shall love your neighbor as yourself.”) Galatians 5:14
So, the law is love. We are to uphold the law. The law is good. But, if you make the law the source of your justification before God, you would be falling away from grace and severed from Christ.
So, to read this and understand that the law is love, but then to immediately say we are justified by "faith working through love" misses the entire point. Those who follow God will uphold this law of love, but not for justification!!!!
Right after this sequence, Paul tells us how we anticipate righteousness.
(For through the Spirit, by faith, we ourselves eagerly wait for the hope of righteousness.) Galatians 5:5
As a side note, before I get comments about how this proves you can lose salvation, Paul makes this entire section a hypothetical by deliberately putting an if clause
"that if you accept circumcision"
Because he was already certain that the Galatians did not take this view.
(I have confidence in the Lord that you will take no other view, and the one who is troubling you will bear the penalty, whoever he is.) Galatians 5:10