Just as a reminder, because it is a controversial subject, that first, if someone believes it is a sin for them it is. Therefore, if GerhardEbersoehn feels devoted to the the law then he should. Romans 7:6 says that we are free from the law, but continues on in 7:8
"What shall we say, then? Is the law sinful? Certainly not! Nevertheless, I would not have known what sin was had it not been for the law. For I would not have known what coveting really was if the law had not said, “You shall not covet." and 7:11-12.
"For sin, seizing the opportunity afforded by the commandment, deceived me, and through the commandment put me to death. 12 So then, the law is holy, and the commandment is holy, righteous and good" He, and others, are not doing wrong by holding onto the law.
Why do I say if someone believes something is a sin, that it is for them?
Romans 14:23
"But whoever has doubts is condemned if they eat, because their eating is not from faith; and everything that does not come from faith is sin."
What does the Bible say about foolish arguments?
2 Timothy 2:23-24
"Don't have anything to do with foolish and stupid arguments, because you know they produce quarrels. And the Lord's servant must not be quarrelsome but must be kind to everyone, able to teach, not resentful."
What are we to do about a divisive person?
Warn them once, Warn them twice (I am not speaking about anyone here speaking generally to keep in mind.)
Titus 3:9-11
"But avoid foolish controversies and genealogies and arguments and quarrels about the law, because these are unprofitable and useless. Warn a divisive person once, and then warn them a second time. After that, have nothing to do with them. You may be sure that such people are warped and sinful; they are self-condemned."