My interpretation on Islam is that if you do not follow the Quran WORD FOR WORD then you cannot identify as a Muslim. Every single Muslim should believe the Quran was written by Mohammed, no? And the words Mohammed wrote were sent directly from God. Therefore if you disagree with ANY of the ideas put forward in the Quran (Wife beating, opposition to homosexuality, eating Halal - the list goes on) then you are consciously defying both Mohammed, and subsequently God. And for that there is no greater crime as they are the centerpieces of the Islam religion. To disagree on one part is to discredit the validity of the entire religion itself.
You may argue Christians should follow the Bible word for word, however none of the authors of the bible claimed to have spoken to an Angel directly, therefore it's authenticity is a lot more debatable and up for interpretation.
If anyone has a rebuttal to this, please let me hear it, but from the way I see it, there is no excuse, for the reasons I have mentioned above.