Dennis Greenfield successfully argues here why Islam is a religion of war.
Islamic violence is a religious problem.
Islam derives meaning from physical supremacy, so war becomes an act of faith. To believe in Islam, is to have faith that it will conquer the entire world. And to be a true Muslim, is to feel called to aid in that global conquest, whether by providing money to the Jihadists or to become a Jihadist.
The fulfillment of Islam depends on the subjugation of non-Muslims so that violence against non-Muslims become the essence of religion.
When Hamas states that, “Killing Jews is worship that draws us close to Allah” or the ISIS rapists tell Yazidi girls that rape "draws them closer to Allah", they really do mean it.
... When Muslims explode into outbursts of violent rage over seemingly petty things like a cartoon or a video, it is because to them, any loss of face for Islam is the worst kind of blasphemy because it challenges its supremacy.
Truth and power in Islam are identical. It is not a religion of the oppressed, but of the oppressors.
Mohammed's prophecies are validated by his conquests. The truth of Islam is seen in the expansion of Islam. When Muslims succeed in killing non-Muslims, they prove the truth of their religion.
... Islam is not primarily an inward spiritual experience, but an outward expression of tribal honor. Its religious expression is the upholding of the honor of Islam and its expansion in the same exact ways as the honor and expansion of the tribe are upheld.
That is why Islam suffers from the classically tribal obsession of protecting "honor" by controlling women so that the blood of the tribe is not polluted by outsiders. That is why it is obsessed with any insult, real or imaginary to Mohammed, its theological tribal founder. And why it must continually expand its territory through conflict so that the tribe grows and so that the surplus sons don't stay behind to fight each other over tribal territory. This is true of Syria on a much larger scale.
... By causing infidels to "lose face", the Muslim fulfills the Koranic verse which promises that Allah had sent Mohammed to make Islam supreme over all religions. By contrast when Islam "loses face", an act of blasphemy has been committed, which can only be righted religiously by killing the non-Muslims, thereby forcing them to lose face and once again affirming the physical superiority of Islam.
This creates the cycle of violence, which is not the result of Christian or Jewish oppression, but of the need for Muslims to validate the truth of their faith by oppressing non-Muslims. To co-exist with non-Muslims is blasphemous for a Muslim, when his Koran proclaims "Do not take the Jews and the Christians for friends" (Koran 5:51). Mohammed's final command was to ethnically cleanse the Jews and Christians of the Arabian Peninsula. ISIS sees itself as completing the work that he began.
Islam does not co-exist, for its followers its truth can only be found in conquering non-Muslims.
... Islam has little to it but the material. Even its paradise exists in the form of the sort of physical pleasures that its followers crave, fancy robes, exquisite banquets, golden couches, and of course that famed appeal to the dedicated Jihadist, "curvaceous virgins... and an overflowing cup" (Koran 78:33-34). Islamic Heaven is a grossly exaggerated version of the kind of loot that Mohammed's followers expected to find by following him in the first place, gold, jewels, silk, spices and young girls.
The gang of throat slitters who accompanied Mohammed on his massacres across the region were given a religious incentive that would transcend death.
Even if they died in battle and would not live to enjoy all the jewels, overflowing cups and girls-- the Koran promised it to them in heaven anyway. The gang of robbers, escaped slaves and ambitious desert rats trailed after Mohammed across sand dunes, their minds filled with the promises of rich loot from the caravans they were raiding. And in the feverish heat, the idea that they would receive even better loot if they were to die in battle, making death preferable to life, would have seemed plausible.
Out of such such petty greed and lust did Islam initially expand.
... And now Islam's vendetta is worldwide. Every insecurity translates into a provocation. Every jealous impulse never satisfied explodes into violent rage. Every conflict for thousands of years breeds a new vendetta. Did Muslims once live somewhere? They must reclaim it, for to fail to do so is blasphemous and a betrayal of Mohammed's mission. Did Muslims never live somewhere? Then they must go there now, and raise up minarets and proclaim the superiority of Islam, for to do otherwise is a failure to expand the borders of the Ummah, which is a betrayal of Allah's will.
The very existence of people living free from Islamic dominion, is blasphemy. Blasphemy that must be remedied by bringing them under the rule of Islamic law.
... The intersection of Islam and Terrorism is the inevitable result of Islamic theology which is supremacist and materialist, which when combined with the honor-shame code of a tribal culture, drives it compulsively toward war and conquest.
... in the end, the problem of Islamic violence is the problem of Islam.