What Is The Relationship Of Islamic Thought Upon Western Civilization?

Real history of Islam and the West
On the eve of the second Christian millennium, the Crusaders massacred some thirty thousand Jews and Muslims in Jerusalem, turning the thriving Islamic holy city into a stinking charnel house.
For at least five months the valleys and ditches around the city were filled with putrefying corpses, which were too numerous for the small number of Crusaders who remained behind after the expedition to clear away, and a stench hung over Jerusalem, where the three religions of Abraham had been able to coexist in relative harmony under Islamic rule for nearly five hundred years.
This was the Muslims’ first experience of the Christian West, as it pulled itself out of the dark age that had descended after the collapse of the Roman Empire in the fifth century, and fought its way back on the international scene.
The Muslims suffered from the Crusaders, but were not long incommoded by their presence.
In 1187 Saladin was able to recapture Jerusalem for Islam and though the Crusaders hung on in the Near East for another century, they seemed an unimportant passing episode in the long Islamic history of the region.
Most of the inhabitants of Islamdon were entirely unaffected by the Crusades and remained uninterested in western Europe, which, despite its dramatic cultural advance during the crusading period, still lagged behind the Muslim world.
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Islamic countries had a culture of learning before the Renaissance in Europe. They contributed much in the areas of mathematics and medicine, for example.