Cherry picking something bad from the history of Islam as evidence of the whole religion is just an attempt to rationalize hate. It's silly. On that basis, we can condemn everyone and everything.
To people reading this and who haven't read the Quran, I strongly encourage you buy a copy and dispell a lot of ignorant nonsense you hear. If you haven't, be sure to read some other scrpture too (e.g., the Torah, the New Testament) for context - otherwise the brutality of ancient societies can be taken out of context. (Remember we were still executing witches; hanging, drawing and quartering; etc. just a few centuries ago (not to mention things like Abu Ghraib and CIA torture recently.))
EDIT: For those looking for a good translation, I did some research into that and recommend Arthur Arberry's. It's probably the most respected among non-sectarian scholars, and Arberry was the head of the Department of Classics at Cairo University and a professor of Arabic at Cambridge. Many other translations push one sectarian view or another. In the U.S. you might need to order a used copy of Arberry or from Oxford University Press directly, but it's widely available.
Have you actually read the Quran?
Read the Quran directly, don't just read "about" it:
http://quran.com/9
9:30 "The Jews say, "Ezra is the son of Allah "; and the Christians say, "The Messiah is the son of Allah ." That is their statement from their mouths; they imitate the saying of those who disbelieved [before them]. May Allah destroy them; how are they deluded?"
The 9th Surah is considered one of the latest, therefore, by some, the one of precedence over the others (according to the practice of https://en.wikipedia.org/wiki/Naskh_%28tafsir%29), do read at least that one.