Radrook, would you please cite the scriptural support that Jesus allegedly made this differentiation? I'd be very interested. My Methodist friends celebrate communion as a memorial, as a spritual and symbolic demonstration of His instructions to His disciples. My Catholic friends, and family, something quite different.
First it's good to keep in mind that eating blood was forbidden under the Mosaic Law. Neither were Noah and his descendents ever given permission to eat human flesh or blood.
Genesis 9:3-5
3Every moving thing that liveth shall be meat for you; even as the green herb have I given you all things.
4But flesh with the life thereof, which is the blood thereof, shall ye not eat
Deuteronomy 12:16
Only ye shall not eat the blood; ye shall pour it upon the earth as water.
So Jesus could not have been encouraging the breaking of both the Noachian Covenant nor the Mosaic law while that law was still in effect. That would have been sinful and Jesus is described as morally spotless. So that alone disqualifies the literal interpretation.
Here is the scripture where Jesus tells his disciples that his words are spiritual.
John 6 (King James Version)
47Verily, verily, I say unto you,
He that believeth on me hath everlasting life.
48I am that bread of life.
49Your fathers did eat manna in the wilderness, and are dead.
50This is the bread which cometh down from heaven, that a man may eat thereof, and not die.
51I am the living bread which came down from heaven: if any man eat of this bread, he shall live for ever: and the bread that I will give is my flesh, which I will give for the life of the world.
52The Jews therefore strove among themselves, saying, How can this man give us his flesh to eat?
53Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you.
54Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day.
55For my flesh is meat indeed, and my blood is drink indeed.
56He that eateth my flesh, and drinketh my blood, dwelleth in me, and I in him.
57As the living Father hath sent me, and I live by the Father: so he that eateth me, even he shall live by me.
58This is that bread which came down from heaven: not as your fathers did eat manna, and are dead: he that eateth of this bread shall live for ever.
59These things said he in the synagogue, as he taught in Capernaum.
60Many therefore of his disciples, when they had heard this, said, This is an hard saying; who can hear it?
61When Jesus knew in himself that his disciples murmured at it, he said unto them, Doth this offend you?
62What and if ye shall see the Son of man ascend up where he was before?
63It is the spirit that quickeneth; the flesh profiteth nothing:
the words that I speak unto you, they are spirit, and they are life.
The folowing scriptuires are also pertinent.
Matthew 4:4
But he answered and said, It is written, Man shall not live by bread alone, but
by every word that proceedeth out of the mouth of God.
John 5:24
Verily, verily, I say unto you, He that heareth
my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life.
Luke 4:4
And Jesus answered him, saying, It is written, That man shall not live by bread alone, but by every word of God.