Koran:(2:191-193) "And slay them wherever ye find them, and drive them out of the places whence they drove you out, for persecution [of Muslims] is worse than slaughter [of non-believers]...and fight them until persecution is no more, and religion is for Allah." There is a good case to be made that the textual context of this particular passage is defensive war, even if the historical context was not. However, there are also two worrisome pieces to this verse. The first is that the killing of others is authorized in the event of "persecution" (a qualification that is ambiguous at best). The second is that fighting may persist until "religion is for Allah." The example set by Muhammad is not reassuring.
Koran (2:244) "Then fight in the cause of Allah, and know that Allah Heareth and knoweth all things."
Koran (2:216)- "Fighting is prescribed for you, and ye dislike it. But it is possible that ye dislike a thing which is good for you, and that ye love a thing which is bad for you. But Allah knoweth, and ye know not." Not only does this verse establish that violence can be virtuous, but it also contradicts the myth that fighting is intended only in self-defense, since the audience was obviously not under attack at the time. From the Hadith, we know that Muhammad was actually trying to motivate his people into raiding caravans with this verse.
Koran (3:56)- "As to those who reject faith, I will punish them with terrible agony in this world and in the Hereafter, nor will they have anyone to help."
Koran (3:151)- "Soon shall we cast terror into the hearts of the Unbelievers, for that they joined companions with Allah, for which He had sent no authority". This speaks directly of polytheists, yet it also includes Christians, since they believe in the Trinity (ie. what Muhammad incorrectly believed to be 'joining companions to Allah').
Koran (4:74)- "Let those fight in the way of Allah who sell the life of this world for the other. Whoso fighteth in the way of Allah, be he slain or be he victorious, on him we shall bestow a vast reward." The martyrs of Islam are unlike the early Christians, led meekly to the slaughter. These Muslims are killed in battle, as they attempt to inflict death and destruction for the cause of Allah. Here is the theological basis for today's suicide bombers.
Koran (4:76)- "Those who believe fight in the cause of Allah…"
Koran (4:89)- "They but wish that ye should reject Faith, as they do, and thus be on the same footing (as they): But take not friends from their ranks until they flee in the way of Allah (From what is forbidden). But if they turn renegades, seize them and slay them wherever ye find them; and (in any case) take no friends or helpers from their ranks."
Koran (4:95)- "Not equal are those believers who sit (at home) and receive no hurt, and those who strive and fight in the cause of Allah with their goods and their persons. Allah hath granted a grade higher to those who strive and fight with their goods and persons than to thou.