OK, this is sort of area of expertise for me, having done a lot of reasearch into the halal method of slaughter.
I apologise if this is very boring
In this country, the approved method of slaughter is to stun the animal with a captive bolt (big electric shock) before slitting its throat, so in the eyes of the public, the animal has no awareness of what is being done.
The halal method (allowed on the grounds of religion) is to use a very sharp knife to slit the animals throat without it being stunned first.
Now, understandably, this sounds barbaric, so many meat eaters are opposed to this method.
However, having done research into this, actually, the halal method is better for the animal.
Animals were killed in both methods with sensors placed on pain receptors in the brain, and surprisingly enough, the halal method registered no pain to the animal, as the knife was so sharp, it went straight through the spinal column almost immediately.
With the conventional UK approved method, although the animal was unconcious, the pain registered for minutes.
Chicken slaughtering methods in this country are particularly horrific - the chickens are hung upside down, are dipped into a water bath which electricutes them (in theory) then their throats are slit - but, there is evidence to show that a fairly high number (we're talking about 2%ish her, but considering the many thousands slaughtered every day, this is a huge number) pull their heads up so they miss the electricution, and bleed to death painfully.
Halal would avoid all of that.
So, ethically, for me anyway, halal is certainly not the barbariic practise that many people claim, but probably a much more peaceful way for an animal to be killed.
I'm aware that some people will be distressed reading this, but IMO, meat eaters should be aware of where their meat comes from.
There was uproar recently when it was found that many supermarkets were stocking halal killed meat without stating it on the labels, and the fact that it wasn't stunned before killing didn't sit easy with many UK shoppers. They prefer to think that the animals are unconsious thoughout, and therefore not knowing a thing, even though it's been found that they are in much more pain.