There is no way that you can make Islam into something warm. fuzzy and non-threatening by establishing that at ceretain times and in certain places it was somewhat less barbaric than other contemporary religions.
What matters is what Islam is today vis a vis Western Civilization, and it is inescapable that it is a dark, sinister, primative thing, antithetical to our concepts of freedom and human dignity.
Any attempt to prove otherwise is akin to putting lipstick on a pig.