Scholars’ debate when humans first adopted religion. Some insist it began with the advent of agriculture; some say much earlier but most would not extend it longer than 35,000 years ago. What is truly amazing is that on every continent on earth the gods were all God's of blood sacrifice. Blood sacrifice involves propitiating and seeking favour from the gods by offering them the life of an animal or a human being. The God devours the life force released at death and this ritual is repeated perpetually to please the God. In most cases of animal sacrifice the worshippers can then use the sacrifice as food. This however is rare but not unknown with human sacrifice. These gods then are the Vampire Gods. Blood sacrifice is feeding the gods. No ancient religion began differently.
This leaves two choices to be considered: either humans have an ingrained impulse to believe that the gods desire blood or the idea spread around the world after being conceived of within one culture. Australia presents the main difficulty in verifying the theory of world wide spread. Due to continental drift Australia separated from the rest of the world over 55,000 years ago including its Aboriginal inhabitants. Yet when Europeans arrived in Australia the Aborigines practiced both human and animal sacrifice. So at present the origins of religion are undecided.