2 Cor.3:18 is about progressive sanctification, is that what you see too?
Remember, born again Christians are still living with their flesh that is not born again so it's possible to have a body that sins and/or wants to sin, but a spirit that does not sin and/or want to sin.
We're also dealing with a certain amount of time, as well. Meaning, how must time do we give a person (and their condemning heart) to actually change? Is six months enough time to be Transformed (Romans 12:2)? Or, 1 year? How about 2 years? Or, 5 years? At what point does a person finally surrender and tell themselves, "You know, I don't think that God has given me a New Heart SO THAT (NLT) I will be CAUSED (KJV) to stop living the way that I do and am, and start living a New, Holy, and Transformed Life."
Ezekiel 36:25-27 NLT - "Then I will sprinkle clean water on you, and you will be clean. Your filth will be washed away, and you will no longer worship idols. And I will give you a new heart, and I will put a new spirit in you. I will take out your stony, stubborn heart and give you a tender, responsive heart. And I will put my Spirit in you so that you will follow my decrees and be careful to obey my regulations."
Ezekiel 36:25-27 KJV - "Then will I sprinkle clean water upon you, and ye shall be clean: from all your filthiness, and from all your idols, will I cleanse you. A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh. And I will put my spirit within you, and cause you to walk in my statutes, and ye shall keep my judgments, and do them."
This is precisely what we are NOT being taught by "pastors" of today. We are NOT being taught that we WILL be changed, and not by our own power, but by the Power of the Spirit . . . True Circumcision.
The below Scripture is SO important to understanding our Faith (for both Jew and Gentile):
Romans 2:27-29 NLT - "In fact, uncircumcised Gentiles who keep God's law will condemn you Jews who are circumcised and possess God's law but don't obey it. For you are not a true Jew just because you were born of Jewish parents or because you have gone through the ceremony of circumcision. No, a true Jew is one whose heart is right with God. And true circumcision is not merely obeying the letter of the law; rather, it is a change of heart produced by God's Spirit. And a person with a changed heart seeks praise from God, not from people."
If we do not see Transformation in our thinking and behavior, there is only one reason: We have NOT received the Circumcision of Christ. When, oh when, will our apostate "pastors" begin to teach us the Truth?