Catholics and several other Christian churches believe that Holy Communion is not just a memorial but a sacrament in which one partakes of the living body and blood of Christ. Each Christian Church has subtle variations in trying to explain this mystery. For Catholics, by taking the transformed host one goes further into becoming a part of the mystical body of Christ.
For most Christian believers, partaking in the Eucharist is the opposite of natural eating. With the Eucharistic meal, the eater becomes part of the eaten, whereas in natural eating the reverse is true: the eaten becomes part of the eater.¹
Concerning the Catholic theological distinction between essence and form, essence is not to be taken as mere mattery/energy—that is, the fabric of the observable universe. For Catholics, essence is a spiritual term that means something qualitatively different from matter/energy.
This important point is often misunderstood or entirely overlooked by New Age / Quantum Physics enthusiasts who recast the old myth of naturalistic pantheism into the latest scientific language, which arguably is just another myth.
Clearly, not everyone accepts the idea of primary substance. Non-believers tend to think of it as mumbo jumbo. And Catholics are sometimes called derogatory terms like “wafer biters.”
The philosopher David Hume and others who probably never felt the glory of the Eucharist argued that since primary substance cannot be perceived, it should not be assumed to exist.
However, many who do experience tangible effects from the Eucharist would likely see Hume’s perspective as limited, one coming from a mind constrained by worldliness, materialism and an over-reliance on conceptual reasoning. As Wikipedia notes
The claim that substance cannot be perceived is neither clear nor obvious, and neither is the implication obvious.²
¹ Some New Age and Shamanistic believers might dispute this, saying that when we eat an animal we temporarily merge with its soul, which continues into an afterlife.
How to Handle Religious Traditions that Aren’t Yours (weddingbee.com)
City and state leaders honor ‘different type of gateway’ with church (bostonherald.com)
World Renown Bible Answer Man Hank Hanegraff Realizes That Protestantism Is A False Religion, And Accepts Eastern Orthodox Christianity. Countless Evangelicals Are Now Leaving Protestantism And Accepting Roman Catholicism And Eastern Orthodox Christianity (shoebat.com)