2 Corinthians 5:10 KJV
For we must all appear before the judgment seat of Christ; that every one may receive the things done in his body, according to that he hath done, whether it be good or bad.

This isn’t referring to some special judgment where saved Christians receive different eternal rewards based on works. It is referring to the ONE Judgment Day. Are you saved or will you be damned?

1 Peter 4:17-18 KJV For the time is come that judgment must begin at the house of God: and if it first begin at us, what shall the end be of them that obey not the gospel of God? [18] And if the righteous scarcely be saved, where shall the ungodly and the sinner appear?

Grace, mercy, and belief are all needed for salvation, but our actions(deeds and/or works) matter.