One of the things that sets Catholics apart from other denominations is Communion. Since the followers of Christ were Jews and consuming blood was an abomination, why would they believe they were ingesting the actual blood of Christ and bring condemnation upon themselves? Also, wouldn’t the wafer, if it became the literal body of Christ, be an abomination to Catholics since cannibalism is a sin? Jesus was offered as a sacrifice for sin once upon the cross, and there is no more need of a sacrifice. Communion has been understood as being symbolic, or else it would have never been accepted by the disciples. The blood shed on the cross is the last time the blood of Christ flowed. His body was last on earth the day he ascended into heaven. To say the juice and wafer becomes the literal blood and body of Christ is saying he is sacrificed anew, which is an impossibility.