This has been happening in the Middle East for more than 1000 years. If you think ISIS is something new then you really need to get an education.
Murdering each other is a way of life in the Middle east. Their holy books demand you kill non believers
Christian Bible (2 Chronicles 15:12-13) - "They entered into a covenant to seek the Lord, the God of their fathers, with all their heart and soul; and everyone who would not seek
the Lord, the God of Israel, was to be put to death, whether small or great, whether man or woman."
Christian Bible (Deuteronomy 13:7-12) - "If your own full brother, or your son or daughter, or your beloved wife, or you intimate friend, entices you secretly to serve other gods, whom you and your fathers have not known, gods of any other nations, near at hand or far away, from one end of the earth to the other: do not yield to him or listen to him, nor look with pity upon him, to spare or shield him, but kill him. Your hand shall be the first raised to slay him; the rest of the people shall join in with you. You shall stone him to death, because he sought to lead you astray from the Lord, your God, who brought you out of the land of Egypt, that place of slavery. And all Israel, hearing of this, shall fear and never do such evil as this in your midst."
Christian Bible (Deuteronomy 17:2-5) - "Suppose a man or woman among you, in one of your towns that the LORD your God is giving you, has done evil in the sight of the LORD your God and has violated the covenant by serving other gods or by worshiping the sun, the moon, or any of the forces of heaven, which I have strictly forbidden. When you hear about it, investigate the matter thoroughly. If it is true that this detestable thing has been done in Israel, then that man or woman must be taken to the gates of the town and stoned to death."
The difference between the Christian sects are trivial.... etc. Although I am in agreement with you about bringing peace to the Middle East being more or less futile, at least until the day some faction detonates a nuclear weapon at Mecca and/or Jerusalem.