Q. Why can’t Protestants receive communion at the Catholic Church?
A. To protect them from Judgment.
1 Corinthians 11: 27 Therefore, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be
guilty of sinning against the body and blood of the Lord. 28 A man ought to examine himself before he eats of the bread and drinks of the cup. 29 For anyone who eats and drinks without recognizing the body of the Lord eats and drinks judgment on himself. 30That is why many among you are weak and sick, and a number of you have fallen asleep.
Since, Protestants do not believe in the Real Presence of Jesus in the Eucharist as we do, they do not discern or recognize that Jesus’ body is present under the appearance of bread and wine. We would be allowing them to eat and drink judgment upon themselves. The prohibition is actually very charitable but, unfortunately, it is usually seen as a rejection.
Evidence of this interpretation of this passage is supported by St. Justin the Martyr :
“We call this food Eucharist; and no one else is permitted to partake of it, except one who believes our teaching to be true…”
-Justin Martyr –FIRST APOLOGY, 66,20–(150 A.D.)
Q. Why do we call the bread “The Host”?
A. Our use of this term, to refer to the consecrated bread, comes from the Latin word hostia, which means ‘victim’. We believe that Jesus Christ is really present in the consecrated bread and wine on our altars. The mass is a re-presentation of the sacrificial death of Jesus on the cross. Therefore, Jesus is the victim of sacrifice and we call the bread the host/victim to help us remember that it is no longer bread but the Real Presence of our Lord Jesus Christ given to us to strengthen and keep us on the journey to Heaven.