The Mass vs. The Lord's Supper

Every Roman Catholic priest will tell you that all the claims of the Church of Rome stand or fall with the doctrine of the real presence of Christ in the Mass. If the bread and wine used in the Sacrament of the Mass, when consecrated by the priest, are changed in some mysterious way into the body, blood, soul and divinity of our Lord Jesus Christ so that the communicant receiving the bread actually takes into his mouth and eats and digests the body, blood, soul and divinity of our Lord Jesus Christ—if this is true, then the Church of Rome is the true church of Christ and every one of us should be members of it. But if it is false, if it is absolutely opposed to the teaching of the Word of God, then the Church of Rome is an apostate church and every faithful believer should come out of her in order that he might not be held accountable for her sins.