It's a Metaphor!
I could be one of the last people to hear about this, judging by the fact that it was in my small, local newspaper this morning, and by the number of hits I got searching for" communion, gluten, invalid," but if originality were required, the blogosphere would collapse down to about a dozen blogs, plus us.....
In short, an eight-year old with a life-threatening intolerance of wheat gluten has been told that her first Roman Catholic communion was invalid because a rice cracker was substituted. Apparently this is a long-standing problem, stemming from the Church's decision that only an unleavened wheat product is sufficiently similar to the Last Supper communion to qualify: ten years ago the Roman Catholic Church decided to stop accepting gluten-intolerant candidates for priesthood because they, like alcoholics, could not safely carry out the rituals. It has also come up in Asian Catholic communities, where the call to replace the 'staff of life' with something resembling the local staple has been a continuing issue. But the Roman Catholic Church has stood firm.
This is particularly acute in this case, as it is a life-threatening condition. In the Jewish tradition, only two commandments cannot be broken even under life-threatening conditions: idolatry and adultery. There are very clear standards that require the ill or infirm to refrain from religious practices that would endanger their health, though the passage on what a pregnant woman has to endure in order to break the Yom Kippur fast is pretty rigorous.
For the sake of fairness, I will note that I have the same problem with the Israeli Orthodox Rabbinate's decision to carry out 'recircumcision' rituals on Ethiopian Jews whose circumcision was done in good faith under Ethiopian (pre-Rabbinic) Judaism. Yes, ritual is important. But it isn't magic and it isn't computer programming: procedural precision has got to be secondary to intent. Ritual is a tool by which we express a relationship with the divine, not a tool by which we require something of the divine. Unless there is a significant theological distinction being made, some variation in practice is tolerable. If God's word is literal law, we are all damned.