The “us against them” mentality going on in the Church is just as toxic as the “us (church) against the world” mentality.
This mentality comes from our habit of forming assumptions, judgment, and cliques based on the flaws and theological differences that we see in others while ironing our own. We feel great when we are “not like those…”
But “those” people are a part of you. Those people are a part of Christ.
It is just way too easy to become a pharisee standing on a higher ground.
I have been tempted and failed many times as well on falling into this trap. One way I have found that may help is to substitute the “they”with “we” in my mindset. For example, if you find yourself prone to saying things like, “those Christians don’t understand the gospel”, why not turn it into perhaps something like this, “May we all understand the gospel. Lord, help us to cherish the gospel so that we can love You and others even more.” In His grace, amen.