Spoken from a totally Western viewpoint where icons mean nothing, gnosticism denies that each human is BOTH body and soul, and rationality reigns supreme. Thus the revelation is “irrational”.

In order for the Church’s teaching to make any sense, one needs to recognize the importance Christ lent to his Body is reflected in the words “This is my Body”, in the feast of the Incarnation, and in the definitions of the Council of Ephesus (431) and the Council of Chalcedon (451). 

Then one needs to understand what a priest actually is, what function he performs, the meaning of “anamnesis”, the iconic value of the Mass, and the Church’s theology of the Eucharist.

In particular one needs to understand the theology of the letter to the Hebrews.