I can’t answer the questions you ask about what Catholics should do, but I would like to comment on what you have said. I suspect, though I too have seen no surveys, that one might find similar results amongst western noncatholics whose communions, like Lutheranism, profess the real presence. And even though we express the nature of His presence differently, it is troubling that many doubt His presence.I haven’t taken a poll, but over the years I have discussed theology, including the Eucharist, with a number of Catholics - family members and friends.
It seems to be that almost all of them treasure the Eucharist but do not believe that they are receiving the actual body and blood of Christ. Like most Protestants, they regard it as symbolic - important and even powerful to most of them but not as the church teaches. Are these people heretics? Have they automatically excommunicated themselves? Should they avoid receiving communion altogether? What should they be told? I doubt if their priests know their doubts or disbeliefs. Should they confess their disbelief?
Code:My analysis? We live in an age when it's difficult for most people to believe that a prayer of consecration spoken by a priest in any way changes the substance of bread and wine. That can seem like a superstition more in keeping with the Middle Ages. But the idea that the spirit of Christ is present at Mass - that he is indeed present - is easy to accept. Didn't he promise to be with us always and everywhere?
I agree with you, that based on His own words, “this is my body”, this should be something we easily accept on faith. It is curious to me that some who think His presence is merely symbolic in the Eucharist, have no trouble believing the virgin birth or physical resurrection.
Jon