I tend to adhere to these Scripture messages...
Titus 3:9-11 But avoid foolish controversies, genealogies, dissensions, and quarrels about the law, for they are unprofitable and worthless. As for a person who stirs up division, after warning him once and then twice, have nothing more to do with him, knowing that such a person is warped and sinful; he is self-condemned....
1 Peter 4:10
As each has received a gift, use it to serve one another, as good stewards of God’s varied grace:
Romans 14:1-23
As for the one who is weak in faith, welcome him, but not to quarrel over opinions. One person believes he may eat anything, while the weak person eats only vegetables. Let not the one who eats despise the one who abstains, and let not the one who abstains pass judgment on the one who eats, for God has welcomed him.
Who are you to pass judgment on the servant of another? It is before his own master that he stands or falls. And he will be upheld, for the Lord is able to make him stand. One person esteems one day as better than another, while another esteems all days alike. Each one should be fully convinced in his own mind. ...
Those are great verses, when you are dealing with groups within the BODY of CHRIST.
The point is, there are groups who want people to think they are Christians because it legitimizes them (Mormons, JWs), but they are not in the Body of Christ.
That isn’t a quarrel, that is a witness.