@Warlord D Thoran
It is almost certain that the region of Gaul had a larger population of Christians than the entire Abbasid throne. By 1200, the Holy Roman Empire surpassed all nations in terms of Christians. Holy Roman populations would also be larger than any Islamic nation in the high Middle Ages except the Islamic states of northern India. France, Holy Roman Empire and parte of Italy were population juggernauts, the Mid East, not so much.
Though, I do see your point. The loss of Alexandria and Antioch was a great loss for the possibility of Mare Nostrum and thus, Christendom. Which christendom to a large degree was the former Roman economic sphere plus areas such as Scandinavia. However, the loss of Egypt and the Levant was only a loss of a much smaller section of Christendom. Just a section with a large amount of importance psychologically for Christendom.
@LSCatilina
I am not sure what sir
@Warlord D Thoran referred to in regards to ISIS or what period he speaks of. However, there was certainly terror placed upon non Muslim communities during the Abbasid period and in states following it. The Abbasid throne promoted a societal and organic assault on various communities to both show the dominance of Islam and put the weaker in their place. This included defacing statues, buildings, icons, lynchings, etc...
Some examples include the culture of desecration in Iran against Zoroastrians. Often, young Muslim converts or Arabs/Iranians (from Muslim backgrounds) would desecrate Zoroastrian sites and buildings and statues. The law of the land defended these activities as it was the duty of a Muslim to destroy idols and symbols of worship given to one other than Allah. The only exception is to those whom the ummah has a security pact with. Zoroastrians often were excluded from this pact... The most famous examples is the desecration of Cteshipon, Zoroastrians burials, Sassanid artwork, Buddhist statues. Al-Afshin himself was executed for a conspiracy he was supposedly apart of, his words were nullified due to witnesses that claim he stopped desecration of Zoroastrian idols.
Ya'qub al-Safar famously destroyed the idols of the Zun and Buddhists in Afghanistan. He did so not for loot, but to prove the night of Islam and all scholars and chroniclers agree to this. The same can be said for the Abbasid supported state of the Ghaznavid and Ghurid. Both of which captured thousands of slaves and idols, idols sent back to Baghdad where they were mocked and destroyed in front of the populace. These sort of traits and actions though, are not unique to Islam, it derives directly from the ancient Mid East, Akkad, Assyria, etc...
Also small point, the Khawarij revolt of the 860s, were perhaps the greatest threat and destroyer of Iraqi Christians until the reign of Timur. Khawarij forces actively targeted Christians, not for religious reasons though. But for loot, Syriac communities often were unprepared for war and relied upon their Abbasid overlords for protection. That sort of foe, is an open target.
Though what you say, is true to a great extent. Abbasid period and following Muslim states in the Mid East focused on battling other Muslim claimants than they did hounding the Christian communities.