The whole of the Gospel is defined for us in Romans six through eight. The Apostle Paul tells us We have died to sin and have been joined with Christ in his death, burial and resurrection in Romans six. Immediately after we read the great news of having died to sin we discover in Romans seven we have also died to the Law. Dying to the Law means it has no jurisdiction over we who have placed our faith in Jesus’ death, burial and resurrection. Romans 10:4 tells us “Christ is the end of the law for righteousness to everyone who believes.”
Thinking about Galatians 2:20 I sort of saw it in new light; let me see if I can explain. Paul said, “I (our supposed, independent I but the I that is really in union with the spirit of error) am crucified with Christ; nevertheless I (new me now separated from the prince of the power of the air and in union with Christ) live; yet not I (as if independent), but Christ (in union with me) lives in me; and the life which I (really Christ) now live in the flesh I (joined to Christ) live by the faith (faithfulness) of the Son of God, who loved me, and gave himself for me.”
Ultimately the work of God, through the cross of Calvary, is the breaking of man’s unholy union to the spirit of error in order to restore mankind to our oneness with God. God’s image in man was damaged through the fall so Christ (God in human form) came here, lived the perfect sinless life and yet died our sinful man’s death on the cross. In that horrible death he “became sin” so we might be made “the righteousness of God in him.” Jesus Christ took the spirit of error into himself and died. When he died the spirit of error left him, because he had no sin of his own, and once a body dies the spirit has to leave. So God is telling those, that have placed their faith in Christ, we have been crucified with him so we might be freed from the spirit of error through him to walk in newness of life.