When you adjust for levels of industrial development, I really don't see a large gradient of humaneness between the way we slaughter animals and the tradition you referenced in that article. Both involve decapitating beasts that are later eaten. I think you and I both agree that the world would both be a better place if this ended in all cultures.
If you're going to slaughter animals at all, there is actually some good, I'd argue, in doing it publicly and ceremonially. The ceremonious nature of it reminds people that the animals' life is something of value. The public nature of it simply reminds people of where their food is coming from. Don't you think it's kind of messed up the way the raising, slaughter, and preparation of meat in the West is hidden entirely from the public eye, at least for the 80% of us that live in cities? It makes people forget what was required to bring meat to their dinner table, and more apt to take meat for granted. I doubt it's a coincidence you're a vegan when you grow up around animals farmed for meat. Vegetarianism is pretty common in Hindu countries too, and I bet seeing a ceremony like this only makes some vegetarians there even more resolute.
If your aim in starting this thread is just to bash religion, well we don't do that in here, sorry.