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look at the reaction of his DISCIPLES, people who had heard his teachings for so long and followed him

60 On hearing it, many of his disciples said, “This is a hard teaching. Who can accept it?”...

66 From this time many of his disciples turned back and no longer followed him.

You cannot say that this was just bread and wine of that this is a metphor for coming and having faith in the Lord or some kind of metphor for believing in Christ because of the reaction of the Jews and the very language -- to eat one's flesh and drink the blood means to do violence on some one. You see it even in Hindi where a threat is "Mein tera Khoon pie jaongaa" or "I will drink your blood" -- and this is among vegetarians! To drink a persons blood means a serious threat of injury.So, if you believe that this was just a metphor, you mean to say that Christ is rewarding people for crucifying Him?!! That's nonsensical, sorry.

You cannot even say it was a metaphor by incorreclty comparing it to John 10:9 (I am the gate/doorway) or John 15:1 (I am the true vine) is because this is not referenced in the entire verse in the same way as John 6 which shows the entire incident from start to finish of Jesus saying His body is to be eaten, repeating it and seeing his disciples go and not correcting them (as he did in Matthew 16).

Even in the literal sense -- Christ says he is the gateway to heaven and the vine such that we get nourishment with him as the connecting path. But John 6 is much much more than mere symbolism as He categorically states that "For my flesh is food indeed, and my blood is drink indeed" (John 6:55).

Even at the end of John 6, Jesus rebukes those who think of what He has said as a metaphor by emphasising that

61 Aware that his disciples were grumbling about this, Jesus said to them, “Does this offend you?
62 Then what if you see the Son of Man ascend to where he was before!
63 The Spirit gives life; the flesh counts for nothing. The words I have spoken to you—they are full of the Spirit[e] and life.
64 Yet there are some of you who do not believe.”

Jesus repeats the rebuke against just thinking in terms of human logic (Calvin's main problem) by saying

John 8:15 You judge by human standards; I pass judgment on no one.
16 But if I do judge, my decisions are true, because I am not alone. I stand with the Father, who sent me.

Just using human logic as Calvinist thought does, without God's blessings behind it fails in grace.John 6:63 does not refer to Jesus's statement of his own flesh, if you read in context but refers to using human logic instead of dwelling on God's words.

And, all of this is confirmed in Paul's writings to the Corinthians (1 Cor. 10:16)

6 Is not the cup of thanksgiving for which we give thanks a participation in the blood of Christ? And is not the bread that we break a participation in the body of Christ?

and also 1 Cor 11:27-29

27 So then, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of sinning against the body and blood of the Lord.
28 Everyone ought to examine themselves before they eat of the bread and drink from the cup.
29 For those who eat and drink without discerning the body of Christ eat and drink judgment on themselves.

how clear does it have to be for you to accept Christ's literal words, repeated TWICE?