One of the most disturbing passages in the Bible comes in the Gospel of John after Jesus feeds the 5000. In the passage known as the Bread of Life passage, we read,

Jesus said to them, “Very truly I tell you, unless you eat the flesh of the Son of Man and drink his blood, you have no life in you. Whoever eats my flesh and drinks my blood has eternal life, and I will raise them up at the last day. For my flesh is real food and my blood is real drink. Whoever eats my flesh and drinks my blood remains in me, and I in them. Just as the living Father sent me and I live because of the Father, so the one who feeds on me will live because of me. This is the bread that came down from heaven. Your ancestors ate manna and died, but whoever feeds on this bread will live forever.” (John 6.53-58)

This is an echo of what we read in other gospel accounts about the Last Supper:

While they were eating, Jesus took bread, and when he had given thanks, he broke it and gave it to his disciples, saying, “Take and eat; this is my body.” Then he took a cup, and when he had given thanks, he gave it to them, saying, “Drink from it, all of you. This is my blood of the covenant, which is poured out for many for the forgiveness of sins. I tell you, I will not drink from this fruit of the vine from now on until that day when I drink it new with you in my Father’s kingdom.” (Matthew 26.26-29)

Mark’s account is similar because his gospel is a source for Matthew’s:

While they were eating, Jesus took bread, and when he had given thanks, he broke it and gave it to his disciples, saying, “Take it; this is my body.” Then he took a cup, and when he had given thanks, he gave it to them, and they all drank from it. “This is my blood of the covenant, which is poured out for many,” he said to them. “Truly I tell you, I will not drink again from the fruit of the vine until that day when I drink it new in the kingdom of God.” (Mark 14.22-25)

And the same for Luke:

And he took bread, gave thanks and broke it, and gave it to them, saying, “This is my body given for you; do this in remembrance of me.” In the same way, after the supper he took the cup, saying, “This cup is the new covenant in my blood, which is poured out for you.” (Luke 22 19, 20)

In all four accounts, Jesus makes the same ghastly claim: eating his body and drinking his blood is essential for human well-being. John 6.52 records the Jews’ response: “Then the Jews began to argue sharply among themselves, ‘How can this man give us his flesh to eat?'” While they’re not saying it outright, they are saying what most modern humans would say were they exposed to this notion for the first time: “This guy’s talking about cannibalism and vampirism!”

Indeed, there are few things in Christianity as disturbing as the cannibalistic ritual at its very core. No matter how one interprets this, it’s simply disgusting and barbaric. Protestants view it symbolically, which seems to lessen the effect, but it’s still troubling to think that millions of Protestants each Sunday symbolically eat human flesh. Catholics have an even stranger view of it, believing that the wafer they eat somehow mysteriously transforms into the actual body of Jesus even though it still looks like a cracker. For them, then, it’s not symbolic cannibalism but actual cannibalism.

If these Christians had not been raised hearing these words on a weekly basis and encountered it in another religion, they would be disgusted. It’s conceivable that Christians would reject whichever religion did teach this primarily on the basis of this teaching.