Every ancient civilization concluded you have to kill something and eat it to talk to God. The substance of sacrifice changed over time. Ba'al's priests offered bulls. Abraham offered a ram. Jesus offered bread and wine. The sequence is one of the oldest patterns in religion, one that maps onto the astronomical ages with almost unsettling precision.
Why blood? Why fire? Why did they eat the sacrifice? Spill the blood of the innocent? The answer connects Göbekli Tepe, Molech, Ba'al, Mithra, Abraham, and The Last Supper and more.
The full story is almost never told, so I wrote a long one on this. It's a deep read. Pour something strong and buckle up.