[Gen 6:9]:

"This is the account of Noah. Noah was a righteous man, blameless among the people of his time, and he walked with God."

Hebrews 11:7 sheds some light on the subject of Noah's righteousness - that it came about through the faith of Noah and not his actions. His actions instead reflected the fact that he had placed his faith in God:

[Heb 11:7]:

"By faith Noah, when warned about things not yet seen, in holy fear built an ark to save his family. By his faith he condemned the world and became heir of the righteousness that comes by faith."

Acknowledgment to God alone of sin is the only way that any man, (all of whom are born in sin, ((Ro 5:12)), can deal with his sin before God thus to be accounted by God as blameless. This acknowledgment to God first comes by faith in God's plan of salvation to deal with that sin by His grace alone which is through trusting alone in the sacrifice of His Son for that sin:

[Eph 2:8-9]:

(v. 8) "For it is by grace you have been saved, through faith - and this [salvation is] not from yourselves, it is the gift of God -

(v. 9) not by works, so that no one can boast."

[Compare 1 John 2:1-2 (NASB)]:

1  My little children, I am writing these things to you so that you may not sin. And if anyone sins, we have an Advocate with the Father, Jesus Christ the righteous;
2  and He Himself is the propitiation for our sins; and not for ours only, but also for those of the whole world."

[1 John 1:1-10 (NASB)]:

1 "What was from the beginning, what we have heard, what we have seen with our eyes, what we have looked at and touched with our hands, concerning the Word of Life—
2  and the life was manifested, and we have seen and testify and proclaim to you the eternal life, which was with the Father and was manifested to us—
3  what we have seen and heard we proclaim to you also, so that you too may have fellowship with us; and indeed our fellowship is with the Father, and with His Son Jesus Christ.
4  These things we write, so that our joy may be made complete.
5  This is the message we have heard from Him and announce to you, that God is Light, and in Him there is no darkness at all.
6  If we say that we have fellowship with Him and yet walk in the darkness, we lie and do not practice the truth;
7  but if we walk in the Light as He Himself is in the Light, we have fellowship with one another, and the blood of Jesus His Son cleanses us from all sin.
8  If we say that we have no sin, we are deceiving ourselves and the truth is not in us.
9  If we confess our sins, He is faithful and righteous to forgive us our sins and to cleanse us from all unrighteousness.
10  If we say that we have not sinned, we make Him a liar and His word is not in us.

[Compare Ro 4:5]:

"However, to the man who does not work but trusts God Who justifies the wicked, his faith is credited as righteousness"

Compare the full study on this matter

After one has accepted Christ as Savior from one's sins - settling the matter of one's sins in eternal matters, i.e., being declared blameless unto eternal life, then the acknowledgement is to be to God relative to one's daily sins in order to be declared righteous and purified, i.e., blameless on a moment to moment basis in one's daily life:

[1 Jn 1:9]:

"If we confess ["homologomen" = acknowledge] our sins, He is faithful and just and will forgive us our sins and purify us from all unrighteousness."

Compare the full study on this matter

Therefore, we can conclude that Noah acknowledged his sin before God and God accounted him blameless as a result of that faith. Noah did this because he trusted that God would indeed take care of his wrong doing.

So Noah, Job, Abraham, David or anyone are not seen by God as blameless in their own right but by the right of Christ, the Son of God, Who died for that sin.


[Compare Eph 1:4-5]:

(v. 4) "For He [God] chose us [believers] in Him before the creation of the world to be holy and blameless in His sight. In love

(v. 5) He predestined us to be adopted as His sons through Jesus Christ, in accordance with His pleasure and will"