Edited by Agatha:
Edited to match quoted post
A testament to what about it? It is a religion whose holy book people attempt to retrofit to science in order to claim it must be the divine word of god. It isn't alone in this, and just because this is a rather poor attempt to paper over the cracks doesn't mean that this thread is unique either.
However, Islam is also a religion whose holy book very explicitly states that apostates should be killed. The Bible also shares this trait, but the quran is unique in how often it repeats this commandment. Not just the proclamations about how we will burn in hell (although that crops up constantly too) but to kill us. The Quran directly instructs Muslims to kill all non believers wherever they find them. More than once. That's a pretty disgusting book.
I have no problem with Muslims. I in fact find it impressive that there are so many good people who profess to believe in the violent, supremacist book of horrors that is the Quran, just like I find it impressive there are so many good people who profess to believe in the violent, supremacist book of horrors that is the Bible.
I do have a problem with any supremacist ideology. Any ideology that states that those outside of it should be killed and deserve to be killed is a horrifying one. I don't care if it is a religious ideology like Islam and Christianity or a political one like Fascism.