I am not sure it is just Halal or Kosher that may be cruelty to animals though, Eliza. As has been said here and elsewhere, done correctly the knife across the throat is less painful than some of the stunning methods. Prior to stunning a skilled butcher or slaughterman would perform the necessary with a minimum of distress to the animal to ensure good meat ensued. The introduction of unskilled labour has resulted in the need for stunning and, even then, someone not very good at it will cause untold distress.

The only way to ensure what you want is to revert to farming methods that allow the animals to lead a stress free life prior to butchering and a skilled slaughterman at the end of their life. The method of slaughter, provided that it does not cause undue distress, is an aside. Trouble is that is not going to happen now and to single out one potentially barbarous method of keeping and slaughtering livestock over another does not make sense.

DtG