Islam IS the solution. History has shown this. Look at the example of the Prophet Muhammad saws. Look at the final and most serious battle in his life, the retaking of Makkah, how did the muslims enter the people who fought and killed their brethren? When Umar ibn al-Khattab entered Jerusalem. When Salahuddin entered Jerusalem. What did the Muslims do when they took over Spain and ruled it for close to a thousand years? How did the Christians and the Jews live under Muslim rule in?