In John 10 we see that a metaphor is being given. Observe that a minute later Jesus becomes a shepherd rather than a door, and each time there is an explanation fo the metaphor in direct terms: salvation is by Jesus as entry into the sheephold is through the door, Jesus gives His life for us like a shepherd would give his for the sheep. In the words of Institution ("This is my body", etc) there is no room to see a metaphor: there is no explanation in what sense is the bread now His body and there is an instruction to the Apostles to "do this". You don't tell people to "do" metaphors.
Then why don't we also drink water as the "water of life" that Jesus said he was?
John 4:9-14
Then the woman of Samaria said to Him, “How is it that You, being a Jew, ask a drink from me, a Samaritan woman?” For Jews have no dealings with Samaritans. Jesus answered and said to her, “If you knew the gift of God, and who it is who says to you, ‘Give Me a drink,’ you would have asked Him, and He would have given you living water.” The woman said to Him, “Sir, You have nothing to draw with, and the well is deep. Where then do You get that living water? Are You greater than our father Jacob, who gave us the well, and drank from it himself, as well as his sons and his livestock?” Jesus answered and said to her, “Whoever drinks of this water will thirst again, but whoever drinks of the water that I shall give him will never thirst. But the water that I shall give him will become in him a fountain of water springing up into everlasting life.”
JOHN 6:63 It is the spirit that gives life, the flesh is of no avail; the words that I have spoken to you are spirit and life.
But Jesus did tell them to do it in remembrance of Him.
Matthew 26:
26 Now as they were eating, Jesus took bread, and blessed, and broke it, and gave it to the disciples and said, "Take, eat; this is my body."
27 And he took a cup, and when he had given thanks he gave it to them, saying, "Drink of it, all of you;
28 for this is my blood of the covenant, which is poured out for many for the forgiveness of sins.
It's from John 6 right near the place where Catholics claim that Jesus said they had to eat His actual flesh and drink his actual blood.
John 6:52-58 The Jews then disputed among themselves, saying, "How can this man give us his flesh to eat?" So Jesus said to them, "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. Whoever feeds on my flesh and drinks my blood has eternal life, and I will raise him up on the last day. For my flesh is true food, and my blood is true drink. Whoever feeds on my flesh and drinks my blood abides in me, and I in him. As the living Father sent me, and I live because of the Father, so whoever feeds on me, he also will live because of me. This is the bread that came down from heaven, not like the bread the fathers ate and died. Whoever feeds on this bread will live forever."
Here it says that whoever eats His flesh and blood will live forever and never die.
Don't Catholics die?
If they do, does that mean they didn't REALLY eat Jesus REAL flesh and blood?