Paul is very clear to me; it’s sad that he is not clear to you. Pray that your blackage be removed.
So, the early Christians -- who knew Christ and Paul or knew the Apostles believed that Paul was very clear "The bread IS a participation in the body of Christ" and "who eats the bread... will have to answer for the body and blood of the Lord" This is not just mere bread and wine anymore. This is the body and blood of Christ. -- I think I'd rather hold with people who lived around the time of Christ rather than with some editor 2000 years later...
Ignatius of Antioch (disciple of Apotle John) wrote in AD 110 wrote about heretics who abstain from the Eucharist and from prayer, because they do not confess that the Eucharist is the flesh of our Savior Jesus Christ, flesh which suffered for our sins and which the Father, in his goodness, raised up again" (Letter to the Smyrnaens)
So, I'm sorry, but the Early Christians hold to the True Presence of Christ in the Eucharist -- which is what we in orthodoxy and even a Protestant like the Lutherans believe in...