I think we have to ask ourselves, 'What Would Jesus Do?' about God authorized Church leaders, and the flock, in fighting.
NAB MAT 21:37
"Finally he sent his son to them, thinking, "They will respect my son.' When they saw the son, the tenants said to one another, 'Here is the one who will inherit everything. Let us kill him and then we shall have his inheritance!" With that they seized him, dragged him outside the vineyard, and killed him."
NAB MAT 23:2
Then Jesus spoke to the crowds and to his disciples, saying, “The scribes and the Pharisees have taken their seat on the chair of Moses. Therefore, do and observe all things whatsoever they tell you, but do not follow their example. For they preach but they do not practice.
NAB MAT 12:14
When the Pharisees were outside they began to plot against him to find a way to destroy him.
NAB MAT 23:23
"Woe to you, scribes and Pharisees, you hypocrites. You pay tithes of mint and dill and cummin, and have neglected the weightier things of the law: judgment and mercy and fidelity. (But) these you should have done, without neglecting the others. Blind guides, who strain out the gnat and swallow the camel! "Woe to you, scribes and Pharisees, you hypocrites. You cleanse the outside of cup and dish, but inside they are full of plunder and self-indulgence. Blind Pharisee, cleanse first the inside of the cup, so that the outside also may be clean. "Woe to you, scribes and Pharisees, you hypocrites. You are like whitewashed tombs, which appear beautiful on the outside, but inside are full of dead men's bones and every kind of filth. Even so, on the outside you appear righteous, but inside you are filled with hypocrisy and evildoing. "Woe to you, scribes and Pharisees, you hypocrites. You build the tombs of the prophets and adorn the memorials of the righteous, and you say, 'If we had lived in the days of our ancestors, we would not have joined them in shedding the prophets' blood.' Thus you bear witness against yourselves that you are the children of those who murdered the prophets; now fill up what your ancestors measured out! You serpents, you brood of vipers, how can you flee from the judgment of Gehenna? Therefore, behold, I send to you prophets and wise men and scribes; some of them you will kill and crucify, some of them you will scourge in your synagogues and pursue from town to town, so that there may come upon you all the righteous blood shed upon earth, from the righteous blood of Abel to the blood of Zechariah, the son of Barachiah, whom you murdered between the sanctuary and the altar. Amen, I say to you, all these things will come upon this generation.
NAB MAT 5:20
I tell you, unless your holiness surpasses that of the scribes and Pharisees you shall not enter the kingdom of God."
NAB MAT 23:12
Whoever exalts himself shall be humbled, but whoever humbles himself shall be exalted. "Woe to you scribes and Pharisees, you frauds! You shut the doors of the kingdom of God in men's faces, neither entering yourselves nor admitting those who are trying to enter. Woe to you scribes and Pharisees, you frauds! You travel over sea and land to make a convert, but once he is converted you make a devil of him twice as wicked as yourselves.