Never understood how the concept of
"by faith alone" could gain any traction.
Because the Bible teaches we are justified by grace alone through faith alone. According to John:
Joh 1:12 But to all who did receive him,
who believed in his name, he gave the right to become children of God,
Joh 1:13 who were born, not of blood nor of the will of the flesh nor of the will of man, but of God. (ESV)
According to Jesus:
Joh 3:14 And as Moses lifted up the serpent in the wilderness, so must the Son of Man be lifted up,
Joh 3:15 that
whoever believes in him may have eternal life.
Joh 3:16 “For God so loved the world, that he gave his only Son,
that whoever believes in him should not perish but have eternal life.
Joh 3:17 For God did not send his Son into the world to condemn the world, but in order that the world might be saved through him.
Joh 3:18
Whoever believes in him is not condemned, but whoever does not believe is condemned already,
because he has not believed in the name of the only Son of God. (ESV)
Joh 5:24 Truly, truly, I say to you,
whoever hears my word and believes him who sent me has eternal life. He does not come into judgment, but
has passed from death to life. (ESV)
Joh 6:40 For this is the will of my Father,
that everyone who looks on the Son and believes in him should have eternal life, and I will raise him up on the last day.” (ESV)
Joh 20:31 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. (ESV)
According to Paul:
Rom 3:20 For
by works of the law no human being will be justified in his sight, since through the law comes knowledge of sin.
Rom 3:21 But now the righteousness of God has been manifested apart from the law, although the Law and the Prophets bear witness to it—
Rom 3:22
the righteousness of God through faith in Jesus Christ for all who believe. For there is no distinction:
Rom 3:23 for all have sinned and fall short of the glory of God,
Rom 3:24
and are justified by his grace as a gift, through the redemption that is in Christ Jesus,
Rom 3:25 whom God put forward as a propitiation by his blood,
to be received by faith. This was to show God's righteousness, because in his divine forbearance he had passed over former sins.
Rom 3:26 It was to show his righteousness at the present time, so
that he might be just and the justifier of the one who has faith in Jesus.
Rom 3:27 Then what becomes of our boasting? It is excluded. By what kind of law? By a law of works? No,
but by the law of faith.
Rom 3:28
For we hold that one is justified by faith apart from works of the law.
Rom 3:29 Or is God the God of Jews only? Is he not the God of Gentiles also? Yes, of Gentiles also,
Rom 3:30 since God is one—
who will justify the circumcised by faith and the uncircumcised through faith. (ESV)
Rom 5:1 Therefore,
since we have been justified by faith, we have peace with God through our Lord Jesus Christ.
Rom 5:2
Through him we have also obtained access by faith into this grace in which we stand, and we rejoice in hope of the glory of God.
…
Rom 5:15 But
the free gift is not like the trespass. For if many died through one man's trespass,
much more have the grace of God and the free gift by the grace of that one man Jesus Christ abounded for many.
Rom 5:16 And
the free gift is not like the result of that one man's sin. For the judgment following one trespass brought condemnation, but
the free gift following many trespasses brought justification.
Rom 5:17 For if, because of one man's trespass, death reigned through that one man, much more will those
who receive the abundance of grace and the free gift of righteousness reign in life through the one man Jesus Christ.
Rom 5:18 Therefore, as one trespass led to condemnation for all men,
so one act of righteousness leads to justification and life for all men. (ESV)
Rom 6:23 For the wages of sin is death, but
the free gift of God is eternal life in Christ Jesus our Lord. (ESV)
Rom 10:8 But what does it say? “The word is near you, in your mouth and in your heart” (that is,
the word of faith that we proclaim);
Rom 10:9 because,
if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved.
Rom 10:10
For with the heart one believes and is justified, and with the mouth one confesses and is saved. (ESV)
Gal 2:16 yet
we know that a person is not justified by works of the law but through faith in Jesus Christ, so we also have believed in Christ Jesus,
in order to be justified by faith in Christ and not by works of the law, because by works of the law no one will be justified. (ESV)
Gal 3:1 O foolish Galatians! Who has bewitched you? It was before your eyes that Jesus Christ was publicly portrayed as crucified.
Gal 3:2 Let me ask you only this:
Did you receive the Spirit by works of the law or by hearing with faith?
Gal 3:3
Are you so foolish? Having begun by the Spirit, are you now being perfected by the flesh?
Gal 3:4 Did you suffer so many things in vain—if indeed it was in vain?
Gal 3:5 Does he who supplies the Spirit to you and works miracles among you
do so by works of the law, or by hearing with faith—
Gal 3:6 just as Abraham “believed God, and it was counted to him as righteousness”?
Gal 3:7
Know then that it is those of faith who are the sons of Abraham.
Gal 3:8 And
the Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel beforehand to Abraham, saying, “In you shall all the nations be blessed.”
Gal 3:9
So then, those who are of faith are blessed along with Abraham, the man of faith.
Gal 3:10
For all who rely on works of the law are under a curse; for it is written, “Cursed be everyone who does not abide by all things written in the Book of the Law, and do them.”
Gal 3:11
Now it is evident that no one is justified before God by the law, for “The righteous shall live by faith.”
Gal 3:12 But
the law is not of faith, rather “The one who does them shall live by them.”
Gal 3:13 Christ redeemed us from the curse of the law by becoming a curse for us—for it is written, “Cursed is everyone who is hanged on a tree”—
Gal 3:14
so that in Christ Jesus the blessing of Abraham might come to the Gentiles, so that we might receive the promised Spirit through faith.
…
Gal 3:21 Is the law then contrary to the promises of God? Certainly not!
For if a law had been given that could give life, then righteousness would indeed be by the law.
Gal 3:22 But the Scripture imprisoned everything under sin,
so that the promise by faith in Jesus Christ might be given to those who believe.
Gal 3:23 Now
before faith came, we were held captive under the law, imprisoned until the coming faith would be revealed.
Gal 3:24 So then, the law was our guardian until Christ came,
in order that we might be justified by faith.
Gal 3:25 But
now that faith has come, we are no longer under a guardian,
Gal 3:26 for
in Christ Jesus you are all sons of God, through faith. (ESV)
Eph 2:4 But God, being rich in mercy, because of the great love with which he loved us,
Eph 2:5 even
when we were dead in our trespasses, made us alive together with Christ—
by grace you have been saved—
Eph 2:6 and raised us up with him and seated us with him in the heavenly places in Christ Jesus,
Eph 2:7 so that in the coming ages he might show the immeasurable riches of his grace in kindness toward us in Christ Jesus.
Eph 2:8
For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,
Eph 2:9
not a result of works, so that no one may boast.
Eph 2:10 For we are his workmanship, created in Christ Jesus
for good works, which God prepared beforehand, that we should walk in them. (ESV)
Tit 3:4 But when the goodness and loving kindness of God our Savior appeared,
Tit 3:5 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,
Tit 3:6 whom he poured out on us richly through Jesus Christ our Savior,
Tit 3:7 so that
being justified by his grace we might become heirs according to the hope of eternal life.
Tit 3:8 The saying is trustworthy, and I want you to insist on these things, so that
those who have believed in God may be careful to devote themselves to good works. These things are excellent and profitable for people. (ESV)
It literally says "Faith without works is dead" right there in the bible.
In one spot, with a very specific context. James's point is that someone who claims to have saving faith but no works, doesn't have saving faith. Good works
are the evidence of saving faith, of having been justified. No one is justified by good works.
I've heard the counterargument of "If you have that faith, God will work on your heart and good works will follow", but as someone who grew up in a church, let me tell you, nothing could be farther from the truth.
Then such people weren’t saved. Good works are evidence of a saving faith, of having been justified, but they do not save us.