He that feeds on my flesh and drinks my blood has everlasting life, and I shall resurrect him at the last day;

On that occasion Jesus was not speaking to those circumcised Israelites about “everlasting life” as human creatures on a Paradise earth under his millennial kingdom. Rather, he was speaking about the very same opportunity that he was setting before the apostle Peter and his fellow apostles by means of the “sayings of everlasting life.” It was the opportunity to gain inherent life with the Christ in the heavens, “life in yourselves.” (John 6:53) By reigning with him in heaven they could pass on to mankind the life-giving benefits of his sacrifice.b

Those Jews had wanted to “seize him to make him king” to sit on David’s throne. But Jesus chose rather to let his Father make him a king in heaven. (John 6:15, 61, 62) Those Jews were in the Law covenant mediated by Moses. That Law covenant was meant to lead the Jews to Christ and thus afford them the opportunity to become a “kingdom of priests” with him.​—Ex. 19:5, 6; Gal. 3:24, 25.

So, in the discussion recorded in John 6:52-65, Jesus was not talking about the world of mankind as the ones to drink his blood as well as eating his flesh, figuratively, during his millennial reign. He was talking about believers whom he would bring into the new covenant. (Jer. 31:31-34; Rev. 20:4-6)