The consumption of blood is expressly forbidden by God but it’s integral to pagan religion. The fact that it’s merely symbolic doesn’t soften the insult.
What the Qumran community led by James the brother of Jesus teaches us about the blessing of bread and wine and its purpose as opposed to the suspect Pauline reconstruction.
Talks about the original Eucharist (sacrament of bread and wine) at minute mark 21:20
From James Tabor: