I just got an email containing only this question:
Where in the Quran do you see it justify violence against unbelievers?
My answer:
9:5.
9:29.
2:190-193.
2:244.
3:125-126.
3:169.
3:195.
4:71.
4:74-77.
4:84.
4:89-91.
5:33.
5:35.
8:9-10.
8:15-17.
8:39-40.
9:123.
47:4.
Want more? There are plenty of others where those came from.
Any more questions?