[–] 21600634? ago (edited ago)
In John 6 Jesus was not teaching about the Lord's Supper and He certainly wasn't advocating cannibalism. Rather, He was teaching about faith. Our Lord had just fed the 5,000, and the multitudes were seeking Him. They were laboring for the food that perishes. Our Lord knew this and therefore gave them instruction about faith (John 6:26-29). When His audience asked about bread our Lord responds and says: "I am the bread of life: he that cometh to me shall never hunger; and he that believeth on me shall never thirst" (John 6:35). Coming to Christ is what it means to eat, and believing is what it means to drink. In verse 40 Jesus promises all who believe on Him will be raised at the last day.
Also, Roman Catholic doctrine teaches "an invisible miracle." The bread and the contents of the cup allegedly become the body and blood of Christ, even though such a change is not visible. However, there are no "invisible miracles" in the Bible. When Jesus turned the water into wine at Cana, the water actually became wine. (John 2:1-11)