I may not know enough about blood, but it seems to me that it was important to God of the Bible as he wanted blood sacrifices. We know that blood is life, but doesn't that mean it is also death? We love our blood, so we want to keep it positive.
How could this be evidence of any one god when sacrifices of animal and even human have been large parts of all religions going back to the earliest civilizations? What it really suggests is that each culture built their myths on other cultures myths, now called religious synchretism. All these ancient religions worshipping fake gods who prophets said needed sacrifices then the god of Israel shows up and is actually a real warrior deity who actually does require sacrifices?
Animal sacrifice - Wikipedia
Ancient Egypt was at the forefront of domestication, and some of the earliest archeological evidence suggesting animal sacrifice comes from Egypt.
By the end of
Copper Age in 3000 BC, animal sacrifice had become a common practice across many cultures, and appeared to have become more generally restricted to domestic livestock. At
Gath, archeological evidence indicates that the
Canaanites imported sacrificial sheep and goats from Egypt rather than selecting from their own livestock.
[5] At the
Monte d'Accoddi in
Sardinia, one of the earliest known sacred centers in Europe, evidence of the sacrifice of sheep, cattle and swine has been uncovered by excavations, and it is indicated that ritual sacrifice may have been common across Italy around 3000 BC and afterwards.
[6] At the
Minoan settlement of
Phaistos in ancient
Crete, excavations have revealed basins for animal sacrifice dating to the period 2000 to 1700 BC
The most potent offering in
Ancient Roman religion was animal sacrifice, typically of domesticated animals such as cattle, sheep and pigs. Each was the best specimen of its kind, cleansed, clad in sacrificial regalia and garlanded; the horns of oxen might be gilded. Sacrifice sought the
harmonisation of the earthly and divine, so the victim must seem willing to offer its own life on behalf of the community; it must remain calm and be quickly and cleanly dispatched.
[20]
Sacrifice to deities of the heavens (
di superi, "gods above") was performed in daylight, and under the public gaze. Deities of the upper heavens required white, infertile victims of their own sex:
Juno a white heifer (possibly a white cow);
Jupiter a white, castrated ox (
bos mas) for the annual oath-taking by the
consuls.
Di superi with strong connections to the earth, such as Mars, Janus, Neptune and various
genii – including the Emperor's – were offered fertile victims