If we think halal (its called zabiha when it involves the slaughter of an animal for meat) is cruel, then we need to also look at Kosher slaughter. Zabiha slaughter does allow the stunning of some animals before slaughter. The*British Halal Food Authority*approves of low-voltage electrified water baths to stun poultry and electric tong stunning for sheep and goats
http://halalfoodauthority.com/faqs
Kosher slaughter, on the other hand, allows no stunning for any animal so shouldn't you be fighting for the humane slaughter of Jewish meat too?