The verse in Isaiah 53 is talking about Jesus being a "guilt-offering". My view is that Jesus took care of our sin which alievates our guilt. It is not that He takes care of our guilt so that we can continue to sin.
Jesus Christ paid our penalty for our sins (death) in order to pardon our guilt, and then His righteousness was imputed to our account, to offset any condemnation or future wrath or judgment from God.
This does not mean sin disappears from our lives, for we remain in earthly bodies still subject to the law of sin, but by God's grace and the power of the indwelling Holy Spirit, we are freed to serve righteousness.
Romans 6 tells us how to approach serving God while crucifying the sin that creates tension and remorse within us as believers. I John 3:2-23 also instructs in this regard.
All Christians experience a tension between serving as new spiritual creatures and putting away our natural man.
I really do not think any of you are incorrect about this, other than those who claim they do not ever sin because they are changed ontologically and are without sin.
Christians are renewed in their spirit, but they are stuck with the old flesh, and we all need to learn how to deal with this state of being, until death.