Which God or Goddess will drink the blood of their own creation ? Animals are the most beloved creatures for Gods. All Hindu Gods are associated with some or other animal. Lord Shiva wears a snake, Lord Vishnu raid on an Eagle and Lord Brahma love Swan. Lord Murugan loves peacock, Lord Ganesh is the combined form of Elephant and Man. Then, which God will appreciate this blood bath?
For that matter Islam and Christianity also prohibit slaughtering animals.
Please look at the following link........Mass Animal Sacrifice "Festival"
We are talking about 21st century, Internet, conquering the moon............even now why these festivals and Bloodbath ? Why these superstitions ?