What Jesus gave to His disciples in the Upper room was bread and as HE IDENTIFIED it, wine. He did not leave it ambiguous because HE called the ritual a remembrance of Him and His giving HIS BODY and BLOOD on that cruel Cross, for us and for our salvation. Catholiciism tells their adherents that the priest feeds to them the soul and divinity and the real body and blood of JESUS. The Body Jesus now occupies in Heaven does not have blood distributing The LIFE throughout that body. JESUS did not teach His disciples to get His Spirit LIFE in them by eating His flesh and blood. That is the carnal error catholiciism makes, bending the spiritual TRUTH to be a pagan rite of eating ‘the food sacrifice’.
Many religions think that physical activity and ceremonies make men right with God.
The Jews fell into that trap as well, but Paul explained the purpose of the Law was to lead people to Christ and that God wanted worshipers who would worship Him in spirit and truth.