They did not leave for that reason. Your chronology is completely wrong. You would be right if it was not for the clarification where Christ explains what he meant. If they left because of his statements concerning flesh…why did they not leave after THOSE statements? (John 6:53) They did not. You can say they did; but they did not. They were still there. When DID they leave? Why did they leave?
My chronology is spot on. Note the growing discontent in the crowd.
“I tell you the truth, 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 him 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 him. 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. Our forefathers ate manna and died, but he who feeds on this bread will live forever. He said this while teaching in the synagogue in Capernaum.” (Jn 6:53-58)
Rather than quieting the crowd which had broken out into arguments about what he had just told them, Jesus pressed his point home even more emphatically: “my flesh is real food and my blood is real drink.” In fact, whereas he had initially said positively, ”If a man eats of this bread, he will live forever,” now he has just stated the negative result of failing to do so: “Unless you eat the flesh of the Son of Man and drink his blood, you have no life in you.” Thus, Jesus has clarified his meaning by stating what happens if we do – and do not – eat his flesh and drink his blood.
The next verse is particularly revealing: “On hearing it, many of his disciples said, “This is a hard teaching. Who can accept it?” (Jn 6:60) Notice that it was not Jesus’ typical enemies, the Pharisees and Sadducees, who rejected his teaching on this occasion but his
disciples – those believers who followed him from place to place and hailed him as the Messiah. They had seen Jesus perform many miracles and heard him teach wondrous things. But this was too much even for them.
“Aware that his disciples were grumbling about this, Jesus said this to them, “Does this offend you? What if you see the Son of Man ascend to where he was before! The Spirit gives life; the flesh counts for nothing. The words I have spoken to you are spirit and they are life. Yet there are some of you who do not believe.” Jn 6:61-64
It is your contention that they left over Jesus’ claim here. Rubbish. Jesus has just issued a challenge to those who knew were grumbling about his “hard teaching.” He is telling them to choose whether they will believe or not.
Not only does Jesus continue to uphold the literal meaning of his teaching, but he presses even further by asking that if this bothers them, what will they do when they see him ascend to heaven? Protestants do not deny the ascension of the resurrected Jesus, yet here Jesus places two key truths side by side. He is saying, in effect, “If eating my flesh causes you theological problems, just wait until you see what else I have planned…you ain’t seen nothing yet!”
The gospel continues: “From this time, many of his disciples turned back and no longer followed him. “You do not want to leave too, do you?” Jesus asked the Twelve. Simon Peter answered him, “Lord, to whom shall we go? You have the words of eternal life. We believe and know that you are the Holy One of God.” Jn 6:66-69
There is a lot going on in these three verses; let’s look at them closely. After hearing Jesus declare that his flesh is real food and his blood is real drink, his disciples, his followers, could not accept his words and no longer followed him. Of course, if they had understood that his body and blood were being used as
symbols, they would have had no complaint. It was precisely because they understood exactly what Jesus meant that they refused to follow him any longer. Therefore, there can be no doubt as to what the eyewitnesses understood Jesus to be saying.
Now, imagine the scene: Jesus has been teaching a crowd, and many of them have gotten up to leave because they could not or would not accept his words. In rejecting his teaching, they rejected the one who gave it and turned their backs on the savior of the world. Thus, their souls were at risk of eternal separation from God. Jesus came to seek and save what was lost; therefore, if these disciples had a simple misunderstanding of the metaphorical language he had used that might cause them to spend eternity in Hell, Jesus would have corrected their error. But we do not see him chasing them down the road saying, “Wait, everyone. I think there’s been a misunderstanding … let me explain what I meant.” **Jesus could not correct a misunderstanding because there had been none. **
Instead, he watched sadly as they departed and then turned to the Twelve, the closest of his disciples, and put the question directly to them: “What about you? Are you leaving too?” In doing so, Jesus was risking everything he had been working for since he had first called Simon and Andrew to follow him by the shore of the Sea of Galilee. If the Twelve had abandoned him at this crucial moment, Jesus would have had to begin again with a new group of Apostles to whom he would entrust his teachings and upon whom he would build his church. By God’s grace, Simon Peter, the first among the Apostles, responded in faith acknowledging that Jesus is the Holy One of God and accepting this difficult teaching.