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You mean at the last supper where he said, this do in remembrance of me. The one where he said 'this cup is the new covenant'. How can it be the new covenant if it's actually supposed to be blood; but, then he also states that he will not drink of the fruit of the vine again till much later - referencing the cup. So, it's wine, then it's blood, then it's the new covenant, then it's wine again. Oops. So, we understand he is speaking metaphorically because this is no different than any other feast of remembrance. Or do you not know what the bread and wine represented before this? Another oops. These errors in doctrine on your clergy's part occurred because they didn't know what they were reading and didn't know Jewish custom.
Moreover, they didn't want to know the jewish customs and even took to torture and murder of jewish converts under the inquisitions for keeping their old customs.. remember.

Jesus spoke in parables to the unbelievers and in straight talk to the believers, which is why the followers in John 6 left. They were getting the carnal understanding for though they followed, they didn't believe. Jesus gave them every chance to get the spiritual meaning and when they didn't, they were angered and left just like the pharisees and saducees. The bread of life was being eaten in the old testament times - as christ said, man does not live on bread alone; but, on every word that proceeds from the mouth of God. That is the bread of life, God's spoken word to us. Christ was talking about spiritual life, thus the flesh profits nothing because only the spiritual can feed the spiritual. To those that are not spiritually minded and are unbelievers, this remains a riddle that is hard to understand and thus they grab to carnal notion that one must eat the flesh of christ and drink his blood literally.
This was not the message. The message to the contrary was that he would eventually be put to death and that if one was going to have any part in the kingdome, they'd have to take the benefit of that sacrifice by believing and confessing as Peter did in Matthew 16:18. That is the eating and drinking - but the carnal mind can't get around that nor does the devil want that message out there. So the more he can confuse the issue and keep people in ignorance, the better chance he has. Spiritual warfare - not physical. You should go back to Matthew 16 and read the first part of the chapter and take a lessen. Beware the leaven of the Pharisees and saducees - keep away from their doctrines.