I'm Muslim lol. My parents NEVER told me that I couldn't eat "Christian" food, they just explained I couldn't eat pork etc. It wasn't an issue at school or at my friend's houses. I never regarded it as an allergy either so I guess it just depends on how well the parents explain it and how well they understand religion, becuase from my knowedge there is literally no such thing as Christian food. In Judaism there's a similar concept to halal which is kosher, but even then there's no reason why Muslims can't eat kosher food, as long as it's still halal. Great article though, and I still found the part with the little boy really funny!