"They returned to Europe with progressive ideas and wrote such things as the Magna Carta."
Islamic theology, philosophy and science are the foundations of modern society.
And the ancient - as in BCE - Greeks got the idea of Democracy from Muhammad - AD. Amirite?
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Oh no more, please Mr. Wilde, I am bereft of ribs!
You lot in the past may have invented Algebra, but it was the ancient Mayans who were the first to invent & use '0' in their numerical system. Y'know, Binary. The very basis of what you're using to post your own ignorance. Nope. Not seeing any Muslim at Bletchley Park developing the basis of what would further become the Digital Computer. Oh, and...:
http://en.wikipedia.org/wiki/Magna_Carta
Nope. Not seeing the words 'Allah' & 'Muhammad' in said document. Your argument is invalid. Oh, and if - as you claim - the Crusaders got the idea of civilised society as we know & enjoy it today: Democracy and Rule of Law, a question, if I may: why aren't the likes of Iran & Saudi Arabia democracies, with Separation of Church and State - as in not Theocracies based on the extremely undemocratic and Due Process-roughshod riding Sharia Law - like those here in the West? 'Progressive'?! You keep using that word, Islamists. I do not think it means what you think it means. One word: Burqa.
Take your time, I know it can be a difficult question to answer for the ignorant such as you.