This video says it all.
Is that why Arabic scholars treated Greek texts with such respect?
Is that why the Ottomans let people keep their faith?
Sure there are alot of backwards people in Islam. Same as there were in Christianity, Judaism etc in the middle ages - and still today. Doesn't mean they're all bad though. Infact, contrary to your belifes they are taking over - alot of my muslim friends say enough is enough with immigration. Surprising, isn't it?
My only gripe with islam is the lack of a central authroity. Although the pope did alot of bad things historically, at least in the end he could reform catholic belief. While in Islam, the lack of this central body is holding them back, and of course parts of the quaran which many muslims follow devoutly. However, it must be observed, many muslims are becoming more westernised and dropping these ancient views especially with the rising rold of women is islamic society - this in turn will help sweep away the touch-and-go parts of the quaran and make it a unanimously true and good world religion.
That doesn't mean however that as many people in the west demographically fail to replace themselves, we could end up with a situation similar to that in Yugoslavia by the next century. That remains to be seen though. But a muslim takeover? Rubbish.