For all have sinned, and come short of the glory of God; Being justified freely by his grace through the redemption that is in Christ Jesus: Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God. Romans 3:23-25
The reality of life in this world is that every single person alive is born full of wickedness and sin. Every attribute to committ evil and sin against God is right within our souls and by nature we are children of wrath. By nature we are evil not good. Some would argue this point but God does not argue with man. This is the truth of his word. Man is by nature a sinner and is worthy of death and everlasting punishment in hell. As it is written, “there is no one righteous, no not one.”
That is exactly what God demands in order to have fellowship with him and eternal life. Perfect, complete righteosness is the only thing that he will accept.
However, we are unable to be righteous because “by nature we are children of wrath even as others.” We have sin imputed to us through Adam and by nature we commit sin.
But, God who is rich in mercy provided a propitiation. That is, He provided a substitue for us. God, in order to show forth His righteousness sent forth His Son as a substitute for anyone who believes in Him. We can be justified freely by God’s grace. God set forth His Son as a substitute for those who have faith and confidence in what Christ’s blood can do for us. That blood stands between God and the sinner. So that when the Almighty would condemn us for our sin and send us to hell the blood of Jesus Christ stands in our place and God says, “you are perfectly righteous through my Son. You can enter into fellowship and eternal life with me.”
Without the blood of Christ that was shed on the cross we would all be bound for everlasting hell, but through faith in his blood we can stand perfect in the sight of God.
For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him. 2 Corinthians 5:21