Then why did St. Paul write this?
1 Corinthians 11:27 “Therefore whosoever shall eat this bread, or drink the chalice of the Lord unworthily, shall be guilty of the body and of the blood of the Lord.”
How can you be guilty of a symbol?
1 Corinthians 11:27 “Therefore whosoever shall eat this bread, or drink the chalice of the Lord unworthily, shall be guilty of the body and of the blood of the Lord.”
How can you be guilty of a symbol?"
It is your organization which calls him "St." Paul. Actually, every believer is a "hagios", a holy one, a "s"aint because they are clothed in the righteousness of Jesus.
But, you bring up a good question. Why would Paul write this to folks in Corinth? Because, if you read the entire context, the celebration meals were being infiltrated by those who made them into drunken parties. Perhaps the way "wakes" often turn out.
Those drunks were the ones who did not see the symbolism in the celebration and were by this condemned. They are unbelievers and guilty of the body and blood of Jesus. They are no different than those Jews who, along with the Romans, were being held responsible for nailing Jesus to the cross. Yet, remember, even His death was carried out by the predetermined plan and foreknowledge of God Himself.
Incidentally, a person can be quite guilty of actions which are completely symbolic, as explained by Paul in the letter to the Jews (Hebrews). By returning to the practices of sacrificing animals in accord with the Mosaic Law, those Jews were crucifying, "...to themselves the Son of God, and put(ting) Him to open shame." Such a return demonstrated that they misunderstood what was accomplished by the one-for-all sacrifice of Jesus (a danger the repetitious transubstantiation ritual risks). And such misunderstanding was evidence that these folks were unbelievers. Yet, all they were doing is going back to practice what they believed the Law asked for.
Does that help?