None of them indicate honor killings but rather going to court where there must be 3 witnesses of the suspect having sex which is almost impossible. And even when there is and the court rules against the victim then it's the court's duty to carry the verdict not that of the brother/father/husband..etc. Honor killings has nothing to do with religion but rather customs and tribal thoughts.
For me, religion itself stems from customs, culture and tribal thoughts. In the case of Islam, yes honor killings are not allowed.. I was just pointing out that the idea of killing fornicators is Islamic and that Honor Killings are the consequence of condemning fornicators to death... they happen when the family takes the law into their own hands. So No.. it is related to religion.. at least indirectly.
Apostates should be killed under Islamic Law but there are rules surrounding it where the apostate has to be locked in a room for three days and they try to convince him to repent and go back to Islam. Most apostate executions end up being done by the people and not by the court. Even Christians in Egypt often time kill their apostates (much lesser cases though) even though Christianity does not order their killing.
It is both cultural and religious as both are almost the same.