No matter what, salvation always has the two parts: one deals with sin as a debt (justification). the other deals with personal change. the first motivates the second in people. the 'commands' of the 2nd are NEVER the way a person justifies their sin-debt.
It is chaos to confuse these things.
I agree.
It is obvious to me from your wording that you are familiar with MacArthur's having confused the difference between justification (which is once for all and eternal) and sanctification (which is the issue of the saint's built in access to being able to die to sin daily, and God's desire that he do so).
Part 1 - justification, now enables part 2 sanctification.
Romans 7:4 Wherefore, my brethren, ye also are become dead to the law by the body of Christ; that ye should be married to another, even to him who is raised from the dead, that we should bring forth fruit unto God. 7:5 For when we were in the flesh, the motions of sins, which were by the law, did work in our members to bring forth fruit unto death. 7:6 But now we are delivered from the law, that being dead wherein we were held; that we should serve in newness of spirit, and not in the oldness of the letter.
Galatians 2:19 For I through the law am dead to the law, that I might live unto God. 2:20 I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.