Piper writes on what it means to love enemies of the cross of Christ:
My greatest longing in response to this enmity is that Christians walk in the way of the cross. Yes, militant Islam is big and threatening. It may even be the true Quranic Islam. There are alarmists whose whole tone seems to awaken political and even militant responses from Christians.
My concern is that as the church we distance ourselves from this kind of response and focus on the truth that we will never spread the Christian faith by the sword. Some Muslims may kill to spread their faith. Some Christians have. But it is not the way of Christ. It is not the way of the cross. [Emphasis mine]