On occasion, coming back home from the pub, I'm of a mind for a kebab from the local takeaway. A Halal takeaway. The Kebab meat is lamb. What comes on a big metal skewer, and rotates vertically on a machine that grills it; the meat is sliced off, and (with salad & that funny looking white cream that looks like mayonnaise - but isn't 0_o; ) served in a pitta bread. Very tasty too.
I'm an Atheist.
Sometimes, I like to buy a frozen chicken, to roast & enjoy with some roast spuds & other veg. The ones I find the best - and cheapest - are those at Netto. They come from Brazil, a Catholic country. They have on the packaging 'Halal'.
Moral: 'Halal' or not, it's still food. Do you lot on Free Repubic complain about food from a deli, in which the meat therein is Kosher? (after all, right-wing fundies like you like to lord it over others the fact that you & your ilk 'Support Israel', and all that jazz, amirite?!) If you don't, then you've just destroyed your own argument.
"We are returning our lamb to Costco and trying to find one that is NOT HALAL."
Last time I heard, when dealing with fresh food - from butchers & greengrocers' shops to large supermarkets - even if you do have the receipt, they don't do refunds on such products (only tinned meat); and only then, if said product was 'not of merchantable quality' in the first place - and I doubt 'because it was prepared in a way that conflicts with my religious beliefs' isn't a credible excuse; Halal or no, if it was 'of merchantable quality' when sold originally, then you're screwed either way.
Wasting food is a sin, after all.