But keep away from foolish disagreements. Don't argue about family histories. Don't make trouble. Don't fight about what the law teaches. Don't argue about things like that. It doesn't do any good. It doesn't help anyone.
Warn anyone who tries to get believers to take sides and separate into their own little groups. Warn him more than once. After that, have nothing to do with him.
You can be sure that someone like that is twisted and sinful. His own actions judge him.