John 16:8 And when He [the Spirit] comes, He will convict the world concerning sin and concerning righteousness and concerning judgment: (10) And concerning righteousness, because I am going to the Father and you no longer behold Me; Romans 10:9 That if you confess with Your mouth, Lord Jesus, and believe in your heart that God has raised Him from among the dead, you shall be saved;
Verse 10 means that the Father has been fully satisfied with the Lord's redemptive death, the full payment for our sins, on the cross, and has accepted Him in His resurrection. The resurrection and ascension of Christ are the evidences proving that His redemption has satisfied God and has met all the demands and requirements of God.
If sinners will believe in Christ, God will justify them, for Christ Himself will become their righteousness. Justify means that God fully approves of us according to His standard of righteousness. Do you believe that the Lord died for you, or do you believe that God has raised Him from the dead?
Of course, you believe in both, but you may be surprised to know that not one word is written in the Scriptures declaring that we ought to believe that the Lord has died for us. Rather, we must believe that God has raised Him from the dead; for we may believe that the Lord has died and yet not believe that He was raised from the dead.
If you believe that the Lord has been raised from the dead, this surely implies your faith in His death. Everybody believes that the Lord died, but revelation is needed to believe that the Lord has been resurrected. In Him, the resurrected One, we are accepted before God.