Islam has nothing to do with this. Otherwise they wouldn't have killed her.
Fuck fundamentalist christianity and judaism too while we're at it.
I know everyone has their anecdotal evidence about so and so who "became a better person" after discovering religion, but as a whole, these antiquated belief systems cause more harm than good. A civil society has no need for it.
People say you can't tie these crimes to islam (christianity/judaism) because there is nothing in the quran (bible/torah) that explicitly commands a father and mother to throw acid on their daughter for looking at a dude on a motorcycle. But at the same time, whether we want to admit it or not, these actions are justified by the individual through their belief system/religion. Old testament / abrahamic belief systems have an undercurrent of oppression and violence, not tolerance and understanding.