Romans 6:18 ~ Is Paul saying that once we die to Law and accept Jesus and be resurrected in his resurrection we will sin less / Some become sinless?

Question

Is my understanding right? The reason I ask is as below.

1. This is exactly what Tanakh says about the Messiah, that there will be truth, harmony, peace and everyone will know about the G-d and the desire to rebel against G-d will be gone as they will obey G-ds laws.
2. Does belief in Jesus empower the person to not sin/sin less?
3. Does belief in Jesus mean that even if we sin, G-d will still count us as righteous?

Note: I am asking these questions as I started Romans and I am confused with the writing style of Paul. He seems to contradict his previous sayings and that is where I need help.

Romans 6:15 What then? Shall we sin because we are not under the law but under grace? By no means! 16 Don’t you know that when you offer yourselves to someone as obedient slaves, you are slaves of the one you obey—whether you are slaves to sin, which leads to death, or to obedience, which leads to righteousness? 17 But thanks be to God that, though you used to be slaves to sin, you have come to obey from your heart the pattern of teaching that has now claimed your allegiance. 18 You have been set free from sin and have become slaves to righteousness.

Some verses that talk about the end times and state of people will change for your consideration.

Isaiah 2:1 The word that Isaiah, son of Amoz, prophesied concerning Judah and Jerusalem. 2 And it shall be at the end of the days, that the mountain of the Lord's house shall be firmly established at the top of the mountains, and it shall be raised above the hills, and all the nations shall stream to it. 3 And many peoples shall go, and they shall say, "Come, let us go up to the Lord's mount, to the house of the God of Jacob, and let Him teach us of His ways, and we will go in His paths," for out of Zion shall the Torah come forth, and the word of the Lord from Jerusalem. 4 And he shall judge between the nations and reprove many peoples, and they shall beat their swords into plowshares and their spears into pruning hooks; nation shall not lift the sword against nation, neither shall they learn war anymore.

Isaiah 32:15 Until a spirit be poured us from on high, and the desert shall become a fruitful field, and the fruitful field shall be regarded as a forest. 16 And justice shall dwell in the desert, and righteousness shall reside in the fruitful field 17 And the deed of righteousness shall be peace, and the act of righteousness [shall be] tranquillity and safety until eternity. 18 And My people shall dwell in a dwelling of peace, and in secure dwellings and in tranquil resting-places.

Zephaniah 3:9 For then I will convert the peoples to a pure language that all of them call in the name of the Lord, to worship Him of one accord.

Answer 1

Romans 6:

18 You have been set free from sin and have become slaves to righteousness.

There is a change of master. Satan is no longer our master. Jesus is. We would not sin the way we did before. We should sin less.

1 John 3:

6 No one who lives in him keeps on sinning. No one who continues to sin has either seen him or known him.

But we are not sinless except for a period of time.

1 John 1:

8 If we claim to be without sin, we deceive ourselves and the truth is not in us.

Romans 6:18 ~ Is Paul saying that once we die to Law and accept Jesus and be resurrected in his resurrection we will sin less?

Yes, over an average period of time.

Some become sinless?

No, not for an extended period of time until we have received our glorified body.