No dear. That is exactly what Jesus came to fix! Our fallen human nature. The carnal nature Paul refers to as the flesh. But look in Romans 8:9 for those who are baptized in the Spirit, and who now walk in the Spirit and NOT in our old human fallen nature - the flesh.
9 But you are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in you. Now if anyone does not have the Spirit of Christ, he is not His.
This is the gospel, and what the RCC does not understand because it is spiritually discerned.
And it doesn't come about by water baptism, but by true repentance. And true repentance only need happen ONCE to be given a new nature that does not sin.
1 John 3:9
9 Whoever has been born of God does not sin, for His seed remains in him; and he cannot sin, because he has been born of God.
There are many "Christians" walking around who are the walking dead. They are not born again, and still have no power over sin so are still in their sinful carnal nature. Jesus said "few there are that find it." He knew there are many who love darkness, but want Jesus to save them only from the penalty of sin, but not sin, itself.
acts 2:3 And there appeared unto them cloven tongues like as of fire, and it sat upon each of them.
represents the love of God and the light of truth
Romans 5:5
And hope maketh not ashamed; because the love of God is shed abroad in ourhearts by the Holy Ghost which is given unto us.
The promise (sacred oath or sacrament) of the father acts 2:38-39 with reference to ez 36:25-27
Acts 2:38 Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
39 For the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call.
Ez 36:25 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.
26 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.
27 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.
Hebrews 8:6
But now hath he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established upon better promises. Based on Jer 31:31 Behold, the days come, saith the Lord, that I will make a new covenant with the house of Israel, and with the house of Judah:
A promise is a sacred oath or sacrament!
Baptismal regeneration is the promise of the Father for union in the new covenant!