To blame honour killings on *any* religion is just ignorant and I say that as a fan of no religion.
http://en.wikipedia.org/wiki/Honor_killing#General_cultural_features
"The cultural features which lead to honor killings are complex. Honor killings involve violence and fear as a tool of maintaining control. Honor killings are argued to have their origin among nomadic peoples and herdsmen: such populations carry all their valuables with them and risk having them stolen, and do not have proper recourse to law. As a result, inspiring fear, using aggression, and cultivating a reputation for violent revenge in order to protect property is preferred to other behaviors. In societies where there is a weak rule of law, people must build fierce reputations.
[22]
In many cultures where honor is of central value, men are sources, or active generators /agents of that honor, while the only effect that women can have on honor is to destroy it.
[23] Once the honor is destroyed by the woman, there is a need for immediate revenge to restore it, in order for the family to avoid losing face in the community. As
Amnesty International statement notes:
The regime of honour is unforgiving: women on whom suspicion has fallen are not given an opportunity to defend themselves, and family members have no socially acceptable alternative but to remove the stain on their honour by attacking the woman.
[24]"