Romans 14: 1 As for the one who is weak in faith, welcome him, but not to quarrel over opinions. 2 One person believes he may eat anything, while the weak person eats only vegetables. 3 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. 4 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.
In chapter 12 Paul laid the groundwork for how we should live out the Christ life together: we are members of one body in Christ, each doing our part, using our gifts. In none of those lists do we find the gift of quarrelling, arguing, debating with one another over petty details of the Christian life. But to observe many believers and churches one would think otherwise. Paul's point is simple: they are not Your servant; they are God's servant. Stop always having to be right, smarter, "holier" than each other.