St. Justin the Martyr explains the Mass to the Roman Emperor in 150 AD, representing the basic worship of Christ in the Mass that was practiced throughout the Christian world by 100 AD. His explanation uses the how the Mass was said in Rome and the countryside.
Christianity was essentially an urban phenomenum. After Emperor Constantine, not a baptized Christian until days before his death, signed the Edict.....his part only making Sunday a day of rest for all subjects and allowing Christianity to be legal...not the new spin coming out that Constantine started the Roman Catholic Church. After his time, faith began to move into rural areas.
Jesus said that on the third day, the temple would be torn down and a new one built.
Essentially Jesus Christ is the life of the Catholic Church. We receive His life and Spirit in Word and the Eucharist. When we fall into mortal sin, we are not in Jesus Christ or the Church realistically...because our participation is in the concrete reality of Christ found in the sacraments. So if we commit mortal sin, we are outside the life of the Church.
Jesus provided a few apostles, including Peter, at the Transfiguration to foretell His coming Divine ministry...that would come from heaven when He stands before the Heavenly Father at the altar, wounded but glorious and triumphant, His Divine mission now serving us primarily at the Mass, made present to us, and present to the world in the Daily Sacrifice, He Who brings all men up to Himself.
It is the Risen, Glorious Lord we receive at Holy Communion, the fulfillment of the daily sacrifice of the old temple, the Covenant of the Law replaced by the Covenant of the Blood of the Lamb. For the Passover Last Supper, the Lord did not have lamb....because His Memorial -- the Mass -- would have Him as the glorified Lamb for worship and the atonement of sin of mankind.
Subsequently, the Lord's life of the Word and sacraments -- the Word Made Flesh, bring us into eternal life now.