I think it is truly a matter of ignorance due to the continued separation, over time, from the one, true Church resulting, out of necessity, in personal interpretation of Scripture. There is no connection to Tradition and an extreme lack of knowledge, or disregard, of the early Church, in which the Eucharist was central. To even mention the word “sacrament” evokes a “deer in the headlights” look for many as it is something that is just not taught. Many have never heard the word, much less had it explained. We certainly cannot hold those individuals who have grown up in these faith traditions responsible. I believe they truly love our Lord and are blest for this. They do the best they can with what they have, but what they have is truly lacking, that being the fullness of truth.