One possible problem with your analysis is that you assume that Jesus's words at the Last Supper were an accurate rendering of what he actually said there. However, Paul clearly states that he “received from the Lord”, thus in a vision or revelation, the words that Jesus spoke at the Last Supper — see 1 Corinthians 11.23–25, and then compare Luke 22.19–21 where identical words are written.

The only reasonable conclusion is that Luke is copying Paul’s text, not putting on paper any words he believes the historical Jesus to have said. Matthew’s version (26.26–28) uses slightly different words, but the same message is there (see also Mark 14.22–24.) It seems clear therefore that the synoptic gospels have adopted Paul’s vision as the source of the Last Supper text. It would be reasonable to conclude that, since the words at the Last Supper instituted a new religion, it was not the actual physical Jesus who was responsible for this, rather Paul.

The Church seemed to be aware of this and instigated a cover-up. The term Paul used for the Eucharist was ‘the Lord’s Supper’ (Greek kuriakon deipnon). This was the expression used in pagan mystery religions for the sacred meals dedicated to the saviour-god. Paul’s expression was so redolent of mystery religion that the early Fathers of the Church became embarrassed by it, and they substituted for it the name ‘Eucharist’ which had Jewish, rather than pagan, associations.