Maybe what you really mean is faith apart from works saves. That is true. And we know who has been saved by faith apart from the merit of works by the fact that their faith is not alone void of works.
The person who says they know God in a faith apart from works salvation who has no works, his faith being alone, does not have the salvation he claims he has. If he remains that way he will be rejected when Jesus comes back. That's why each of us has to examine ourselves to see if we are really in the faith-2 Corinthians 13:5. If we see that we are not, we need to stop being deceived and fall on the mercy of God and receive grace to become the person who practices righteousness who will inherit the kingdom when Jesus comes back.
"Do not be deceived; neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor homosexuals, nor thieves, nor the covetous, nor drunkards, nor revilers, nor swindlers, will inherit the kingdom of God."-1 Corinthians 6:9-10
"Now the deeds of the flesh are evident, which are: immorality, impurity, sensuality, idolatry, sorcery, enmities, strife, jealousy, outbursts of anger, disputes, dissensions, factions, envying, drunkenness, carousing, and things like these, of which I forewarn you, just as I have forewarned you, that those who practice such things will not inherit the kingdom of God."-Galatians 5:19-21
"For this you know with certainty, that no immoral or impure person or covetous man, who is an idolater, has an inheritance in the kingdom of Christ and God.
Let no one deceive you with empty words, for because of these things the wrath of God comes upon the sons of disobedience. Therefore do not be partakers with them"-Ephesians 5:5-7
Now notice the diligent 'practice' of those who are assured entrance into the kingdom of God.
"Therefore, brethren, be all the more diligent to make certain about His calling and choosing you; for as long as you practice these things, you will never stumble; for in this way the entrance into the eternal kingdom of our Lord and Savior Jesus Christ will be abundantly supplied to you."-2 Peter 1:10-11
"Do not be deceived." "Be all the more diligent." That's not a works gospel.
He who has ears let him hear.