I think the concept of eating/flesh and drinking/blood is a pagan/heathen concept.
Exodus 34:17
Thou shalt make thee no molten gods.
Deuteronomy 32:17
They sacrificed unto devils, not to God; to gods whom they knew not, to new gods that came newly up, whom your fathers feared not.
Isaiah 42
8 I am YHWH, that is My name; and My glory will I not give to another, neither My praise to graven images.
Isaiah 42
17 They shall be turned back, they shall be greatly ashamed, that trust in graven images, that say to the molten images, Ye are our gods.
graven image from the Hebrew
6459 pecel peh'-sel from 6458; an idol:--carved (graven) image.
1) idol, image
6458 pacal paw-sal' a primitive root; to carve, whether wood or stone:--grave, hew.
1) to cut, hew, hew into shape
a) (Qal) to hew, hew out, quarry
molten image from the Hebrew
4541 maccekah mas-say-kaw' from 5258; properly, a pouring over, i.e. fusion of metal (especially a cast image); by implication, a libation, i.e. league; concretely a coverlet (as if poured out):--covering, molten (image), vail.
1) a pouring, libation, molten metal, cast image, drink offering
a) libation (with covenant sacrifice)
b) molten metal, molten image, molten gods
2) web, covering, veil, woven stuff
Ezekiel 33
25 Wherefore say unto them, Thus saith the Lord GOD; Ye eat with the blood, and lift up your eyes toward your idols, and shed blood: and shall ye possess the land?
I remember, back in the days when I was a Catholic, taking communion. Opening my mouth to receive the host and as I did so, my eyes being raised and there on the wall behind the altar, a large crucifix with the molten/graven image of Yehoshua upon it. Catholics believe that the eucharist becomes the literal body and blood of Christ. Yet, we are warned in the Tanakh (Old Testament) and in the New Testament, to NOT drink/eat blood.
And whatsoever man there be of the house of Israel, or of the strangers that sojourn among you, that eateth any manner of blood; I will even set my face against that soul that eateth blood, and will cut him off from among his people.
Acts 15
28 For it seemed good to the Holy Ghost, and to us, to lay upon you no greater burden than these necessary things;
29 That ye abstain from meats offered to idols, and from blood, and from things strangled, and from fornication: from which if ye keep yourselves, ye shall do well. Fare ye well.