Anyone who pays attention to the news these days cannot help but be appalled by the brazen, boastful brutality of ISIS, skilfully orchestrated for the maximum in publicity value. If a belief in progress and the advance of civilization had led us to think that such things could never happen again, this should be a rude awakening to the evil of which mankind is capable.
It has always been the tendency of every tribe and nation to believe that their god, or their ideology, was superior to all others and destined to triumph over all others. Therefore, it was surely a good thing to use every means available to hasten that triumph.
The teaching of Jesus Christ of Nazareth was a dramatic break with that kind of thinking. He taught His followers not to resist evil done against them, not to seek revenge, but rather to love their enemies and do good to them. The New Testament church is founded upon those principles, yet very early in church history there were those who professed to hold to those principles, yet yielded to the old imperialist impulses. They thought it was a good thing when Constantine made Christianity the state religion. That meant the end of persecution.
Or did it? Within a few years, Augustine of Hippo introduced the doctrine that the grace of God was so beneficial that it was necessary to bring people into the church by brute force. This was totally contrary to the gospel of Jesus Christ, but it led to 1,000 years of brutal persecution all over Europe by the Roman Catholic Church. Christians who did not believe that salvation could be found in the rites and superstitions of the Roman Catholic Church were tortured and killed in all the ways used by ISIS, and more besides. The Roman Catholic church defends itself by saying they did no such thing, it was the governments who carried out ll these acts of brutality. But this was the era where that great city, Rome, reigned over the kings of the earth and required and rewarded such actions by the civil powers.
Karl Marx dreamed of a better world that would be created by class warfare that would eliminate the oppressing classes and lead to the millennium — the dictatorship of the proletariat. That belief led to many years of tribulation in many countries, with unspeakable brutality and untold millions slaughtered — and the millennium did not come. It is a particularly twisted kind of thinking that believes a better world can be created if we kill all the people who stand in the way of that better world.
This all points to the basic need of every human — a new heart. There cannot be peace on earth when there is jealousy, envy, anger and hatred within the hearts of men. Such a change of heart cannot be forced upon anyone, thus compulsion in the name of God must be anathema to Christians.
Who is a wise man and endued with knowledge among you? let him shew out of a good conversation his works with meekness of wisdom. But if ye have bitter envying and strife in your hearts, glory not, and lie not against the truth. This wisdom descendeth not from above, but is earthly, sensual, devilish. For where envying and strife is, there is confusion and every evil work. But the wisdom that is from above is first pure, then peaceable, gentle, and easy to be intreated, full of mercy and good fruits, without partiality, and without hypocrisy. And the fruit of righteousness is sown in peace of them that make peace. (James 3:13-18)