You are totally misunderstanding what people are saying.
Romans 6:16 says "What then? Shall we sin because we are not under the law but under grace? By no means!"
This means that since we are under Grace, any infraction of the Law does NOT condemn us to death. However we still follow it as much as we can since we do love Him.
Sorry for the mis-attribution.
Continued, willful, unrepentant SIN is what will condemn, DESPITE UNTO THE SPIRIT OF GRACE
Hebrews 10:26For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,
27But a certain fearful looking for of judgment and fiery indignation, which shall devour the adversaries.
28He that despised Moses' law died without mercy under two or three witnesses:
29Of how much sorer punishment, suppose ye, shall he be thought worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant, wherewith he was sanctified, an unholy thing, and hath done DESPITE UNTO THE SPIRIT OF GRACE?
30For we know him that hath said, Vengeance belongeth unto me, I will recompense, saith the Lord. And again, THE LORD SHALL JUDGE HIS PEOPLE.
31It is a fearful thing to fall into the hands of the living God.
Your side refuses to acknowledge God's commandments as binding/mandatory, especially His Sabbath. Everyone on this earth who has ever lived, will be judged by God's law, including those who profess Christ..."THE LORD SHALL JUDGE HIS PEOPLE". (Judgment begins at the house of God)
1 Peter 4:17For it is time for judgment to begin with the family of God; and if it begins with us, what will the outcome be for those who disobey the gospel of God? 18And, “If it is hard for the righteous to be saved, what will become of the ungodly and the SINNER?”
Romans 2:11For God does not show favoritism. 12 All who sin apart from the law will also perish apart from the law, and all who sin under the law will be judged by the law. 13For it is not the hearers of the law who are righteous before God, but it is the doers of the law who will be declared righteous
So, breaking God's law, and especially teaching others to do so, won't cause loss of one's salvation? Guess again.
Matthew 5:17Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.
18For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
19Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven.
20For I say unto you, That except your righteousness shall exceed the righteousness of the scribes and Pharisees, ye shall in no case enter into the kingdom of heaven.