Since we live in an age where words such as 'Islam', 'Islamofascist', 'Islamophobia' and so on are bandied about by anyone and everyone, I've decided to do a little reading of my own, and come to some conclusions of my own, regarding Islam and Muslims.
The first thing I've learned, of any use, is this. Islam regards both Moses and Jesus as Prophets. Moses was a Prophet of Law and Righteousness - which is why the OT is composed mostly of narrations of Kings lives, the lives of Judges, and of procedural instruction in relation to ritual holiness. Jesus is regarded as the Prophet of the inner spiritual life, and of the love of God for man. Both received real revelations, and both revelations discuss only one aspect of God's relation to man. Muhammad, however, is regarded as the 'seal of Prophecy' because
his revelation is regarded as the perfect synthesis of, and advancement of the argument of, the two Prophets who went before him, restoring the balance that is (deliberately) lacking in the previous revelations.
And such a view has merit: it's a reasonable way of pointing to the similarities and differences between the three different revelations and of commenting on them - particularly when one can see the two types of over-emphasis so clearly at work on this thread.
Gideon's insistence that his (principled) refusal to celebrate the death of this raghead murderer stems from God's revelation to him (Gideon) is perfectly of the type of inward looking personal holiness enjoined by Jesus. BakerStreet's emphasis upon community, necessary action in order to restore peace through judgement and unashamed punishment, is perfectly in accord with the Mosaic revelation of law and judgment - and the reason there will never be agreement between the two of them upon the issue is that both approach the question through the lenses of two completely opposed types of revelation.
I haven't read (or thought) anywhere near enough on the subject to be able to say with certainty what results from the Muhammadan synthesis of the revelations of Moses and Jesus, but after even the cursory reading I've so far undertaken something emerges as at least a possibility - which is this.
Muslims speak of 'Allah' (actually al-Ilah - 'the One God') as the all-Merciful and the all-Compassionate and at the same time are all too happy to celebrate the death of an enemy. The OT speaks of many occasions when God required the Israelites to exterminate peoples and raze cities to the ground, devoting to the Lord (which means the utter and complete destruction of) all that was in them. And in each case, this is seen as an outpouring of God's righteous wrath exercised in judgment: a victory for God, and only incidentally for the Israelites who were the instruments of that victory.
There is a divorce, in the OT, between the instrument and the One who uses it that leaves no room for a personal sense of threat or a personal sense of victory. The NT in contrast denies that there is any room for violence of any kind in the believer's life, asserting that victory for both God
and believer lies in the defeat of evil through love and the turning of the other cheek.
For the Christian God is either the righteous King and upright Judge who uses the believer to impose an ethic of perfect justice, a justice which is apart from the believer, external to him; or the sacrificial Lamb that waits for slaughter secure in the knowledge that victory is his in another world, if not in this, and that 'love will save the day'.
The Christian who truly follows the revelation of Jesus in his own heart is to do nothing but suffer the contempt of evil men, and pray for their redemption and his own. The Muslim, meanwhile, having an ethic which includes both mercy and violent war exercised on
behalf of of God
by the believer, being righteous in God's eyes (he believes) both when he exercises mercy and kills his enemies, has the West at a psychological disadvantage - one exemplified by the disagreements on this thread.
We will never come to agreement with ourselves, never prosecute this war with the unrelenting ferocity and total commitment to the destruction of the enemy which it demands, while we have it in the back of our minds that a) such relentless ferocity belongs only to God and is to be exercised only under conditions of perfect justice (God may be perfectly just but we know ourselves to be anything but); and

while we're hobbled (if unknowingly) by the belief that gentle Jesus meek n mild won't love us if we do what's necessary to overcome.
An enemy that can stand lightly balanced on both feet, fully prepared and willing to kill his opponent because he knows his God will love him for it, is always going to be at an advantage when confronting someone who can only stand on one foot, because not convinced that God's righteousness is his, and who has tied one hand behind his back in order to be 'merciful' in the application of a violence of which he is ashamed - because to turn to violence at all is to fail his God at the outset.
Wars are not won by missiles, planes, smart bombs and ultra high technology (though these things are good to have). They are won by people willing to die and to take many, many more of their enemies with them when they go. Certainly Muslims appear to possess that conviction and that committment. We, seemingly, do not.