I understand how you see Penal Substitution Theory in those verses, but what you are seeing is an interpretation. Penal Substitution Theory is not in the text of Scripture.Then what should these two truths, put togeather be called? What is its error? . . . For the wages of sin is death, . . . _ . . . while we were yet sinners, Christ died for us. . . . Add, . . . All we like sheep have gone astray. Everyone has turned to his own way; and Yahweh has laid on him the iniquity of us all. . . .
Romans 6:23. Romans 5:8. Isaiah 53:6.
This is what I get out of those three passages:
God demonstrated His love towards us in that while we were sinners Christ died for us. We have been justified by His blood and will be saved from the wrath of God through Him. We now have received the reconciliation.
When we were slaves of sin we were free in regard to righteousness. But now having been freed form sin and enslaved to God, wew derive our own benefit resulting in sanctification and the outcome, eternal life. For the wages of sin is death but the free gift of God is eternal life in Christ Jesus.
Christ bore our griefs and our sorrows He carried. We esteemed Him stricken, Smitten of God and afflicted, but He was pierced through for our transgressions and crushed for our iniquities. The chastening for our well-being fell upon Him and by His scourging we are healed.
All of us like sheep have gone astray, but the Lord has caused the iniquity of us all to fall on Him.