I think we all agree on one thing here: that what those so called parents did was indeed an evil deed and they should be punished severely for it, regardless of who or what they claim they did it for.
We also agree that there are certainly misguided people who do terrible crimes and try to justify them by using religion.
Beyond that, we obviously defer in terms of our faiths and beliefs, but that shouldn't stop us from being polite and respectful towards one another,right? Cheers!