Galatians 5:13-17 cuts to the chase:
For you were called to freedom, brothers. Only do not use your freedom as an opportunity for the flesh, but through love serve one another. For the whole law is fulfilled in one word: “You shall love your neighbor as yourself.” But if you bite and devour one another, watch out that you are not consumed by one another. But I say, walk by the Spirit, and you will not gratify the desires of the flesh. For the desires of the flesh are against the Spirit, and the desires of the Spirit are against the flesh, for these are opposed to each other, to keep you from doing the things you want to do.
If there’s a more straightforward instruction for harmony in God’s church, I don’t know what it is. This passage has everything: our freedom in Christ and our use of it; the Divine Law; a clear warning against discord; and advice about our spiritual walk
So, why is there so much of the opposite in our churches? Well, the answer is in that question: What should be God’s church is, in fact, ours. We typically treat “church” like our own little domain, with immigration rules, political power struggles, defensive strategies, and self-appointed execution squads. But the most pathetic part of it all is, the good church folks who perpetrate such nonspiritual behavior either can’t see their own part in, or they defend their agendas with excuses like, “Somebody’s got to keep it all going.”
Faith tells us, “Obey God and he’ll take care of the rest.” So churchianity obviously lacks faith. And the solution? Revival! Not the kind of “revival” where outsiders get saved, but the kind where church folks get saved. When we begin walking in the faith and love of Christ, those outside the church will flock to the lord to get what they see in us. As the saying goes, “If you love the Lord, tell your face!”