I guess there are thousands of ways in which a slaughter can be made. I am not an expert, so I depend on the opinions of others. One such expert is the Farm Animal Welfare Council here in the UK.
Their reports are presented here
Farm Animal Welfare Council - Reports
Their opinion is that animals must be stunned/rendered unconscious with a blow to their head before slaughter. This avoids the pain they feel. Ofcourse, there is no way of knowing if this is definitely true.
Please read what they have to say on Page 32 of the report
"Report on the Welfare of Farmed Animals at Slaughter or Killing Part Two: White Meat Animals." dated May 2009.
To repeat what I have been saying earlier. I will eat Halal meat if I have no choice. I guess my feelings about this sort of slaughter are not strong enough to totally avoid meat slaughtered using Halal methods.
The information provided above is simply to show that there are good reasons on why I choose non Halal food. There are other threads where I like to make fun of religion. This is not it. If you would still like to think that way then I would ask you to question your own biases about it.