As I said before, we enter into salvation purely by faith and the grace of God. What is confusing you is that someone has told you that once you enter into salvation you can never forfeit it. They are leading you astray.
God does not lead us astray:
Philippians 1: NASB
6For I am confident of this very thing, that
He who began a good work in you will perfect it until the day of Christ Jesus.
Romans 8: NASB
29For those whom He foreknew, He also predestined
to become conformed to the image of His Son, so that He would be the firstborn among many brethren;
30and these
whom He predestined, He also called; and these whom He called, He also justified; and these whom He justified, He also glorified.
Ephesians 1: NASB
3Blessed
be the God and Father of our Lord Jesus Christ, who has blessed us with every spiritual blessing in the heavenly
places in Christ,
4just as He chose us in Him before the foundation of the world, that we would be holy and blameless before Him. In love 5He predestined us to adoption as sons through Jesus Christ to Himself, according to the kind intention of His will,6to the praise of the glory of His grace, which He freely bestowed on us in the Beloved.
7In Him we have redemption through His blood, the forgiveness of our trespasses, according to the riches of His grace
8which He lavished on us.
Ephesians 1: NASB
In Him
11also we have
obtained an inheritance, having been predestined according to His purpose who works all things after the counsel of His will,
12to the end that we who were the first to hope in Christ would be to the praise of His glory.
13In Him, you also,
after listening to the message of truth, the gospel of your salvation—having also believed, you were sealed in Him with the Holy Spirit of promise, 14who is given as a pledge of our inheritance, with a view to the redemption of God’s own possession, to the praise of His glory.
1 Corinthians 1: NASB
4I give thanks to my God always for you because of the grace of God that was given you in Christ Jesus,
5that in every way you were enriched in him in all speech and all knowledge—
6even as the testimony about Christ was confirmed among you—
7so that you are not lacking in any gift, as you wait for the revealing of our Lord Jesus Christ,
8who will sustain you to the end, guiltless in the day of our Lord Jesus Christ. 9God is faithful, by whom you were called into the fellowship of his Son, Jesus Christ our Lord. (NASB)
These are promises.
Perhaps another way to understand the relation of saved by Grace through faith and faithful works is to not separate them?
Ephesians 2: NASB
8For by grace you have been saved through faith; and that
not of yourselves, it is the gift of God;
9not as 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 so that we would walk in them. (NASB)
Notice this Grace through faith is related to verse 10 and cannot be separate as heat and light cannot be separated by fire.
Notice these good works are as a result of us being God’s workmanship created in Christ Jesus. And God prepared them beforehand so we would walk in them.
So we cannot even take credit for this as keeping our salvation as these good works are God’s workmanship.
These are fruits of righteousness through Jesus Christ.
Philippians 1: NASB
9And this I pray, that your love may abound still more and more in real knowledge and all discernment,
10so that you may approve the things that are excellent, in order to be sincere and blameless until the day of Christ;
11having been filled with the fruit of righteousness which comes through Jesus Christ, to the glory and praise of God.