Excellent talking points are identified below for readers who are in a situation where you have to debate someone who proclaims that the Koran doesn’t teach violence any more than the "Bible or Torah". Excerpted from Jihad Watch, written by the expert Robert Spencer:
I discuss this very common argument at length in my book Religion of Peace?; suffice it to say here that van der Galiën's statement, that the Qur'an doesn’t teach violence any more than the "Bible or Torah" is flatly false. For while the Bible contains descriptions of violent acts committed in the name of God, nowhere does it teach believers to imitate that violence. Where people are commanded to commit acts of violence, these are commands directed to specific individuals or groups in particular situations; they are not universal commands.
The Qur'an, on the other hand, quite clearly does teach believers to commit acts of violence against unbelievers -- see 2:190-193, 9:5, 9:29, 47:4, etc. There are no equivalents to such open-ended and universal commands, addressed to all believers to fight unbelievers, in the Bible.
Unfortunately for van der Galiën, there is not a single traditional school of Islamic jurisprudence that would agree with his assessment here, for all of the schools that are considered orthodox teach, as part of the obligation of the Muslim community, warfare against and the subjugation of unbelievers.
Shafi'i school: A Shafi'i manual of Islamic law that was certified in 1991 by the clerics at Al-Azhar University, one of the leading authorities in the Islamic world, as a reliable guide to Sunni orthodoxy, stipulates that “the caliph makes war upon Jews, Christians, and Zoroastrians...until they become Muslim or pay the non-Muslim poll tax.” It adds a comment by Sheikh Nuh ‘Ali Salman, a Jordanian expert on Islamic jurisprudence: the caliph wages this war only “provided that he has first invited [Jews, Christians, and Zoroastrians] to enter Islam in faith and practice, and if they will not, then invited them to enter the social order of Islam by paying the non-Muslim poll tax (jizya)...while remaining in their ancestral religions.” ('Umdat al-Salik, o9.8).
Of course, there is no caliph today, and hence the oft-repeated claim that Osama et al are waging jihad illegitimately, as no state authority has authorized their jihad. But they explain their actions in terms of defensive jihad, which needs no state authority to call it, and becomes "obligatory for everyone" ('Umdat al-Salik, o9.3) if a Muslim land is attacked. The end of the defensive jihad, however, is not peaceful coexistence with non-Muslims as equals: 'Umdat al-Salik specifies that the warfare against non-Muslims must continue until "the final descent of Jesus." After that, "nothing but Islam will be accepted from them, for taking the poll tax is only effective until Jesus' descent" (o9.8).
Hanafi school: A Hanafi manual of Islamic law repeats the same injunctions. It insists that people must be called to embrace Islam before being fought, “because the Prophet so instructed his commanders, directing them to call the infidels to the faith.” It emphasizes that jihad must not be waged for economic gain, but solely for religious reasons: from the call to Islam “the people will hence perceive that they are attacked for the sake of religion, and not for the sake of taking their property, or making slaves of their children, and on this consideration it is possible that they may be induced to agree to the call, in order to save themselves from the troubles of war.”
However, “if the infidels, upon receiving the call, neither consent to it nor agree to pay capitation tax [jizya], it is then incumbent on the Muslims to call upon God for assistance, and to make war upon them, because God is the assistant of those who serve Him, and the destroyer of His enemies, the infidels, and it is necessary to implore His aid upon every occasion; the Prophet, moreover, commands us so to do.” (Al-Hidayah, II.140)
Maliki school: Ibn Khaldun (1332-1406), a pioneering historian and philosopher, was also a Maliki legal theorist. In his renowned Muqaddimah, the first work of historical theory, he notes that “in the Muslim community, the holy war is a religious duty, because of the universalism of the Muslim mission and (the obligation to) convert everybody to Islam either by persuasion or by force.” In Islam, the person in charge of religious affairs is concerned with “power politics,” because Islam is “under obligation to gain power over other nations.”
For this to end, peaceful Muslims around the world would have to confront the fact that bin Laden and other jihad terrorists are regularly justifying their violence by reference to passages of the Qur’an and the words and deeds of Muhammad. If they don’t acknowledge this and formulate new and non-literalist ways of understanding this material, it will continue to be used to incite violence. In other words, the use that jihadists make of elements of the Qur’an and Muhammad’s teaching makes it incumbent upon peaceful Muslims to perform a searching reevaluation of how they understand those elements, so as to neutralize their capacity to set Muslims against non-Muslims.
People will do evil in all kinds of circumstances, and use all manner of justification for it; but the violent passages in the Bible are not equivalent to those in the Qur’an in content, in mainstream interpretation, or in the effect they have had on believers through the ages. The fact that in Islam violence against unbelievers has divine sanction in a way that it does not in Christianity makes religious violence more prevalent and harder to eradicate in Islam than it has ever been in Christianity. To equate it to a jumble of passages from the Bible to which no one would otherwise be paying any attention at all, at least as direct marching orders for twenty-first century warriors, is specious and dangerously misleading.