Well, you must know what the rejoinder is. Christ used a lot of analogies. He called his followers sheep. He said he was a door...and a vine. With the Lord's Supper, it is possible to defend all sorts of POVs by quoting those same words and those he used on Holy Thursday--Transubstantiation, Consubstantiation, spiritual Real Presence, and on and on.
Verily, verily, I say unto you, He that believes on me has everlasting life.
48I am that bread of life.
49Your fathers did eat manna in the wilderness, and are dead.
50This is the bread which comes 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 forever: 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 you eat the flesh of the Son of man, and drink his blood, you have no life in you.
54Whosoever eats my flesh, and drinks my blood, has eternal life; and I will raise him up at the last day.
55For my flesh is food indeed, and my blood is drink indeed.
56He that eats my flesh, and drinks my blood, dwells in me, and I in him.
57As the living Father has sent me, and I live by the Father: so he that eats 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 eats of this bread shall live forever.
Pretty straight forward. It is the doctrine of ALL the original churches, the Eucharist IS the body of Christ.
Unless you eat of it Jesus the Christ has no part in you.