School’s Gluten-Free and Halal Meal Policies Drawing Fire 

If this were my daughter's school, I'd be torn between being thrilled that they constantly had a gluten-free option available, being terrified that they'd put a tiny bit of butter on that gluten-free meal (she's also allergic to milk proteins), and being annoyed that she'd be stuck with meatless meals constantly since we couldn't send alternatives and it sounds like they wouldn't be swapping the Halal meat between gluten-free and non-gluten-free options.  But choosing to only offer Halal meat seems like not such a big deal to me.

Muslims can eat Kosher meat, but Jews cannot eat Halal meats, as they are not produced the same way. So it would seem in the purpose of to “celebrate the diversity of our country’s culture,” providing Kosher meat would be more appropriate; and for the muslims, providing a good falafel, tahini and mixed salad plate would be appreciated. Plus other students would enjoy this option also.

Not okay.  It's one thing to offer healthy meals to the school population - it's another entirely to force your opinion of healthy food and/or dictate to parents their care of their children and basically imply that they are incapable or inept.  I don't go to paranoid extremes, but I do think it's a bad idea to let an organization take choices out of your hands because of 'good intentions', etc.  Such a bad precedent.  Offer it!  Give the choice, but make it a 'choice'.

When oh when will schools learn that gluten-free is not Celiac safe!  Does the vegetarian offering contain egg, yeast or dairy gluten cross-reactors?

There is zero protein in the "vegetarian" gluten-free option.

This type of "diversity" thinking is "exclusive" to people with certain dietary health restrictions.  Furthermore, public schools cannot violate the "Establishment Clause" commonly known as "Separation of Church & State".  It steps "flat" on the "Free Exercise Clause of the First Amendment to the US Constitution!

"When oh when will schools learn that gluten-free is not Celiac safe!  Does the vegetarian offering contain egg, yeast or dairy gluten cross-reactors?"

What? Plenty of Celiacs do just fine with egg, yeast (as long as it wasn't brewing yeast contaminated with barley malt), and Dairy. Gluten Free means just that, free of gluten. 

" Furthermore, public schools cannot violate the "Establishment Clause" commonly known as "Separation of Church & State".  It steps "flat" on the "Free Exercise Clause of the First Amendment to the US Constitution!""

I'm not sure this school in the UK has to abide by the US Constitution but the First Amendment only applies to the federal government and not private businesses (such as this private school) anyway. I doubt your kids lunch is considered "free speech". A stronger argument in the US would be the Americans with Disabilities Act which comes a lot closer to providing legal protection for a child with a medical diagnosis.