Where has God stated that eating flesh is a sin?
Leviticus 4:18 And he shall put some of the blood upon the horns of the altar which is before the LORD, that is in the tabernacle of the congregation, and shall pour out all the blood at the bottom of the altar of the burnt offering, which is at the door of the tabernacle of the congregation.
Leviticus 4:25 And the priest shall take of the blood of the sin offering with his finger, and put it upon the horns of the altar of burnt offering, and shall pour out his blood at the bottom of the altar of burnt offering.
Leviticus 4:30 And the priest shall take of the blood thereof with his finger, and put it upon the horns of the altar of burnt offering, and shall pour out all the blood thereof at the bottom of the altar.
Leviticus 4:34 And the priest shall take of the blood of the sin offering with his finger, and put it upon the horns of the altar of burnt offering, and shall pour out all the blood thereof at the bottom of the altar:
Leviticus 17:13 And whatsoever man there be of the children of Israel, or of the strangers that sojourn among you, which hunteth and catcheth any beast or fowl that may be eaten; he shall even pour out the blood thereof, and cover it with dust.
Christ said his flesh and blood does not profit. .The spirit life of the flesh is in the blood but that kind of life is not literal blood that we need, but a new never ending spirit life.
The blood we are to drink which is a metaphor for pouring out His Spirit, is the life of Christ that he poured out in jeopardy of another, us. Literal blood has no redeeming value when it comes to spirit life, the promise ..
Joel 2:28 And it shall come to pass afterward, that I will “pour out my spirit” upon all flesh; and your sons and your daughters shall prophesy, your old men shall dream dreams, your young men shall see visions:
What is the spiritual meaning of the parable "drink blood", as it relates to Christ... is the question I think we should ask our selves.