The purpose of Christ sacrifice was the removal of sin. To make the believer cleansed and thereby enabling them to be sinnless through God's indwelling Spirit. Lets talk about the Atonement , the At one ment. In the Greek it is, καταλλαγή and it means; an adjustment of a difference, restoration. It is from the root word καταλλάσσω, and it is a compound word form καταwhich means down (in place or time) And ἀλλάσσω which means make other than it is, change, alter. Which in it's simplest direct translation means positional change, altered, the differences being placed apart from us; downed. And since we were the one that needed to be different God sent His son in the likeness of sinful flesh and for sin, condemned sin in his flesh. He was manifested to take away our sin and in Him is no sin, Jesus Christ who through the eternal spirit offered himself without spot to God, purge (cleanse) our conscience (inward man) from dead works (sin) to serve the living God, that the righteousness of the law be fulfilled in us by his indwelling spirit for it is God that worketh in us both to will and do his good pleasure. Sanctified, set apart for holy use, the temple of the most high God. Now this is really interesting. Forgiveness in the Greek is ἄφεσις, and it means freedom. It is from the root word ἀφίημι which means send forth. Gods forgiveness and atonement is a separation from sin; a sending forth; We are separated from it. And this is out of love and His desire to have the most intimate relationship that he can have with us, the at one ment. This my friends is the one and only Gospel. The point of it all the secret of our success. For we through the atonement are members of His body, of his flesh,and of His bones. Which is the fellowship of the mystery, which from the begining of the world hath been hid in God, who created all things through Christ. Of whom the whole family in heaven is named. That he has granted us according to the riches of His glory, Stengthened with might by his spirit in the inner man. Christ dwelling in our hearts by faith; that we, being rooted and grounded in love, may be able to comprehend with all the saints the love of Christ, which passeth knowledge, that we may be filled with all the fullness of God. That is, Christ in us the Hope of Glory. For With men it is and was impossible, but not with God: for with God all things are possible.