While "peace" is a central theme in Holy Scripture, the aggressive side of Christian faith is all but certainly responsible for the many bloody wars started in and from Christian Europe. A key issue, of course, is how that peace is to be achieved. Here, the New Testament message is as crystal-clear as it is-at least by modern standards-indefensible: Jesus Christ himself will return to carry out God's will and by force, empowered by the authority of his resurrection, will establish his father's kingdom of peace on earth. On the basis of this promise, believers in Jesus Christ have at all times claimed access to that power and used it with a good conscience against those they perceive to be enemies of the Gospel.
The prophecy is even now being fulfilled. The Son is here and is carrying out His Father's will and by force in Iraq.