Perhaps this is just me, but I'm snarking at the mindset that allows for things like easily preventable deaths, willful ignorance of things which were accepted as fact centuries ago, and so forth. If it so happens that such views tend to correlate pretty closely with organized religion (or, more specifically, certain types of it), as the vernacular goes, tough shit. I mock vitriolic atheists, but I tend to do so less than I mock dogmatic true believers in part because they're less common, and in part because bullheaded atheists are hypocritical dicks whereas bullheaded religious types are hypocritical dicks that are willing to let children die through inaction in order to uphold their beliefs.
In other words, I don't dislike religion per se, but I dislike a tremendous amount of things which-coincidentally, I'm sure-happen to be associated with religion. It's also a matter of group-versus-individual; I try to avoid judging individuals based on their religion or lack thereof, just like I try to avoid judging them because of anything else. But when someone does something atrocious specifically because of their religious beliefs, I'm not going to avoid noting that out of fear of offending someone. Part of having opinions is dealing with the fact that other people don't agree with them, and with the fact that other people who hold the same beliefs can be irredeemable bastards. I get told to my face on a fairly regular basis that I'm going to burn in hell for eternity, that I'm incapable of moral action, etc. and that's just with me being an atheist who is open to discussing religion, but I'm not complaining about how people shouldn't criticize atheists. If you feel offended, then challenge the assertions the person who offended you was making rather than just saying that people shouldn't be allowed to criticize the beliefs of others.
In the case in point, that couple killed two children specifically because of their religious beliefs. There is nothing wrong in bringing up religion in the discussion of it.