One summer's day in 1990, I walked into a beautiful Crusader chapel in Keserwan, a gentle mountainside north of Beirut, where an old Catholic Maronite priest pointed to a Byzantine mosaic of – I think – Saint John. What he wanted to show me was the holy man's eyes. They had been stabbed out of the mosaic by a sword or lance at some point in antiquity. 'The Muslims did this,' the priest said.

His words had added clarity because at that time the Lebanese Christian army General Michel Aoun – who thought he was the president and still, today, dreams of this unlikely investiture – was fighting a hopeless war against Hafez Assad's Syrian army. Daily, I was visiting the homes of dead Christians, killed by Syrian shellfire. The Syrians, in the priest's narrative, were the same ‘Muslims’ who had stabbed out the eyes in the ancient picture.

I remember at the time – and often since – I would say to myself that this was nonsense, that you cannot graft ancient history onto the present. (The Maronites, by the way, had supported the earlier Crusaders. The Orthodox of the time stood with the Muslims.) Christian-Muslim enmity on this scale was a tale to frighten schoolchildren.

And yet only last year, as shells burst above the Syrian town of Yabroud, I walked into the country’s oldest church and found paintings of the saints. All had had their eyes gouged out and been torn into strips. I took one of those strips home to Beirut, the painted eyes of the saints staring at me even as I write this article. This was not the sacrilege of antiquity. It was done by ghoulish men, probably from Iraq, only months ago.

Like 9/11 – long after Hollywood had regularly demonised Muslims as barbarian killers who wish to destroy America – it seems that our worst fears turn into reality. The priest in 1990 cannot have lived long enough to know how the new barbarians would strike at the saints in Yabroud.

Note how I have not mentioned the enslavement of Christian women in Iraq, the Islamic State’s massacre of Christians and Yazidis, the burning of Mosul's ancient churches or the destruction of the great Armenian church of Deir el-Zour that commemorated the genocide of its people in 1915. Nor the kidnapping of Nigerian schoolgirls. Not even the very latest massacre in Kenya where the numbers of Christian dead and the cruelty of their sectarian killers is, indeed, of epic, Hollywood proportions. Nor have I mentioned the ferocious Sunni-Shia wars that now dwarf the tragedy of the Christians.

Soldiers standing over skulls of victims from the Armenian village of Sheyxalan in 1915, believed to be victims of the Armenian Holocaust (AFP)

But the Christian tragedy in the Middle East today needs to be re-thought – as it will be, of course, when Armenians around the world commemorate the 100th anniversary of the genocide of their people by Ottoman Turkey. Perhaps it is time that we acknowledge not only this act of genocide but come to regard it not as just the murder of a minority within the Ottoman Empire, but specifically a Christian minority, killed because they were Armenian but also because they were Christian (many of whom, unfortunately, rather liked the Orthodox, anti-Ottoman Tsar).

And their fate bears some uncommon parallels with the Islamic State murderers of today. The Armenian men were massacred. The women were gang-raped or forced to convert or left to die of hunger. Babies were burned alive – after being stacked in piles. Islamic State cruelty is not new, even if the cult’s technology defeats anything its opponents can achieve. In Kuwait last week, a good and thoughtful Muslim, an American university graduate – within the al-Sabah family and prominent in the government – shook his head with disbelief when he spoke of Islamic State. ‘I watched the video of them burning the Jordanian pilot alive,’ he told me. ‘I watched it several times. I had to, because I had to understand their technology. Do you know they used seven camera angles to film this atrocity? We could not compete with this media technology. We have to learn.’

Iraq crisis: Yazidi nightmare on Mount Sinjar Show all 15 1 /15 Iraq crisis: Yazidi nightmare on Mount Sinjar Iraq crisis: Yazidi nightmare on Mount Sinjar Iraq crisis Displaced people from the minority Yazidi sect, fleeing violence from forces loyal to the Isis in Sinjar town, walk towards the Syrian border, on the outskirts of Sinjar mountain, near the Syrian border town of Elierbeh of Al-Hasakah Governorate Iraq crisis: Yazidi nightmare on Mount Sinjar Iraq crisis Displaced people from the minority Yazidi sect, fleeing violence from forces loyal to the Isis in Sinjar town, walk towards the Syrian border, on the outskirts of Sinjar mountain, near the Syrian border town of Elierbeh of Al-Hasakah Governorate Iraq crisis: Yazidi nightmare on Mount Sinjar Iraq crisis Displaced Iraqis from the Yazidi community settle at a camp at Derike, Syria. In the camps here, Iraqi refugees have new heroes: Syrian Kurdish fighters who battled militants to carve an escape route to tens of thousands trapped on a mountaintop Iraq crisis: Yazidi nightmare on Mount Sinjar Iraq crisis A pilot based at RAF Marham entering a Tornado GR4 prior to taking off for the reconnaissance mission over Iraq. Several RAF Tornado jets set off from RAF Marham in Norfolk this afternoon to travel to a "pre-position", from where they will fly to northern Iraq to provide improved surveillance of the situation on the ground. The jets, fitted with Litening III targeting and surveillance pods, will be able to fly over the crisis area to provide intelligence and help with the delivery of humanitarian aid Iraq crisis: Yazidi nightmare on Mount Sinjar Iraq crisis A British Royal Air Force (RAF) Tornado GR4 aircraft equipped with the Litening III pod from RAF Marham, eastern England, on their arrival at RAF Akrotiri Cyprus for their reconnaissance mission over Iraq Iraq crisis: Yazidi nightmare on Mount Sinjar Iraq crisis Aid inside a Royal Air Force (RAF) Hercules C130 J aircraft before being airdropped to civilians in Iraq Iraq crisis: Yazidi nightmare on Mount Sinjar Iraq crisis A Royal Air Force (RAF) Hercules C130 J military transport plane at RAF Akrotiri in Cyprus. Britain made a third round of airdrops of supplies to aid refugees stranded on a mountain in northern Iraq, officials said, as Tornado fighters arrived at an RAF base in Cyprus preparing to provide surveillance support for the humanitarian effort Iraq crisis: Yazidi nightmare on Mount Sinjar Iraq crisis Royal Air Force (RAF) Tornado GR4 aircraft, flown in from Britain, stand on the tarmac at RAF Akrotiri in Cyprus Iraq crisis: Yazidi nightmare on Mount Sinjar Iraq crisis A displaced man helps a woman, both from the minority Yazidi sect fleeing violence from forces loyal to the Isis in Sinjar town, as they make their way towards the Syrian border, on the outskirts of Sinjar mountain, near the Syrian border town of Elierbeh of Al-Hasakah Governorate Iraq crisis: Yazidi nightmare on Mount Sinjar Iraq crisis Iraqis including Turkmen, Shabaks, Kurds, Yezidis and Christians, fleeing from assaults of army groups led by Isis, take shelter at Bahirka Camp in Arbil Iraq crisis: Yazidi nightmare on Mount Sinjar Iraq crisis Displaced Iraqis from the Yazidi community look for clothes to wear among items provided by a charity organization at the Nowruz camp in Derike, Syria Iraq crisis: Yazidi nightmare on Mount Sinjar Iraq crisis Displaced Iraqis from the Yazidi community gather for food at the Nowruz camp in Derike, Syria Iraq crisis: Yazidi nightmare on Mount Sinjar Iraq crisis Displaced Iraqis from the Yazidi community gather for food at the Nowruz camp in Derike, Syria Iraq crisis: Yazidi nightmare on Mount Sinjar Iraq crisis Syrian Kurdish Peshmerga fighters take a sick Iraqi Yazidi woman to the clinic at Nowruz camp in Derike, Syria Iraq crisis: Yazidi nightmare on Mount Sinjar Iraq crisis Sick displaced Iraqis from the Yazidi community wait for treatment at a clinic at Nowruz camp in Derike, Syria

And this is true. The West – that amorphous, dangerous expression – has still not understood the use of this technology – especially the use which the cult makes of the internet – nor have the Muslim Arab imams who should be speaking about the fearful acts of Islamic State.

But most are not, any more than they denounced the 1980-88 Iran-Iraq war, when around a million Muslims killed each other. Because they were on Saddam’s side in that war. And because the Islamic State’s ideology is too obviously of Wahabi inspiration, and thus too close to some of the Gulf Arab states.

The crimes of Islamic State are as brutal as any committed by the German army in the Second World War, but Jews who converted were not spared Hitler’s plan for their extermination. What the Islamic State and the 1915 Ottoman Turks have in common is a cruelty based on ideology – even theology – rather than race hatred, although that is not far away. After the burning of churches and of synagogues, the rubble looks much the same.

The tragedy of the Arab world is now on such a literally Biblical scale that we are all demeaned by it. Yet I also think of Lebanon where the old priest showed me his mosaic with the missing eyes and where the Lebanese Christians and Muslims fought each other – with the help of many foreign nations, including Israel, Syria and America – and killed 150,000 of their own people.