I believe the relevant verses usually discussed/debated on this subject include (though not limited to):
"Truly, truly, I say to you, unless you eat the flesh of the Son of man and drink his blood, you have no life in you; he who eats my flesh and drinks my blood has eternal life, and I will raise him up at the last day. For my flesh is food indeed, and my blood is drink indeed. He who eats my flesh and drinks my blood abides in me, and I in him" (John 6:53–56).
"Therefore whoever eats the bread and drinks the cup of the Lord unworthily will have to answer for the body and blood of the Lord. . . . For any one who eats and drinks without discerning the body, eats and drinks judgment on himself" (1 Cor. 11:27, 29)
And welcome to the thread...
I guess taking things out of context is the best way you have to support this argument that the bread and wine actually are Jesus.
John 6:32-33 "Then Jesus said to them, "most assuredly, I say to you Moses did not give you the bread from heaven. For the bread of God is He who comes down from heaven and gives life to the world.""
John 6:35 "And Jesus said to them, "I am the bread of life. He who comes to me shall never hunger, and he who believes in Me shall never thirst.
Clearly Jesus is speaking metaphorically and when he is referring to eating and drinking he is referring to Faith in him and the sacrifice he willingly made on our behalf.
John 6:51 "I am the living bread which came down from heaven. If anyone eats this bread. he will live forever; and the bread that I shall give is My flesh, which I shall give for the life of the world."
Again it is clear Jesus is speaking about FAITH IN HIM. If you want a literal interpretation, we would only have to have communion once and we would live forever. He doesn't say we must eat this bread once a week for the rest of our lives to live. He doesn't say the bread must be touched by a priest with a "magic finger".
It is plain as day. What we must do is have FAITH in JESUS. He will do the rest just as GOD fed the Jews who were fleeing, Jesus will provide.
Being a dyed-in-the-wool pervasive literalist . . .
I'm SOMEWHAT comfortable with a literalist interpretation.
However, to be harshly pontifical and insistent that one of 2-3 possible interpretations of those verses is arbitrarily determined to be the "ONLY POSSIBLE" interpretation . . . is not fitting, to me.