http://www.humanreligions.info/tags/animal_sacrifice.html
Main page:
Animal Sacrifice and Blood Rituals in Traditional World Religions and SatanismHuman Truth Foundation pages (4):
Religion and Vegetarianism: 3. Ritual Animal Slaughter in World Religions
Time to Move On: Religion Has Cost Too Much: 4.4. Animal Welfare and Ritual Sacrifice
Legislation and Faith: Religious Rights and Religious Wrongs: 7.1. Ritual Animal Slaughter
Not from the Human Truth Foundation, but still relevant (2):