Paul knew this first hand. He would say to the Galatians...
"O foolish Galatians! Who bewitches you?...for freedom Christ frees us!" (Galatians 3:1; 5:1)
From what does Christ free us?
Christ freed humanity from the impossible task of saving ourselves. Christ Jesus covered our sin with His blood, redeemed us, reconciled us to God, and gives us His own righteousness before God.
"Christ Jesus gave Himself for us to redeem us from every lawless deed" ... "God was in Christ reconciling the world to Himself, not counting their trespasses against them...He made Him who knew no sin to be sin on our behalf, so that we might become the righteousness of God in Him." (Corinthians 5:16-21)
"There is none righteous, not even one." (Romans 3:10)
All the good works of humanity will not make one person righteous before God.
"...a man is not being justified by works of law, except alone through the faith of Christ Jesus, we also believe in Christ Jesus, that we may be justified by the faith OF Christ, and not by works of law, seeing that by works of law shall NO flesh at all be justified." (Galatians 2:16 CLNT)
It is the faith "of Christ Jesus" that justifies humanity (makes them righteous before God).
Our personal faith in him simply allows us to rejoice that we do not have to save ourselves. Humanity has been reconciled to God by the "BLOOD" of Christ, Justified by the "FAITH" of Christ, and will be Saved from death at the "RETURN" of Christ to free us from the wages of sin - death.
"For freedom Christ frees us".