While Jesus said the first Mass at the last supper, the church didn't officially begin until Pentecost Sunday. From that point on Mass was celebrated daily. The 12 apostles began to travel to other countries spreading the word, ordaining priests and celebrating Mass. The Didache (written around the year 90 AD) and the Apostolic Constitution (written around the year 200 AD) are manuscripts describing the early Catholic Mass and how it was celebrated. Over the next fifteen centuries various popes would introduce different prayers and ceremonies into the Liturgy developing the Latin Mass. In the year 1545 under Pope Pius V, The Council of Trent was called to combat Protestantism and finalize the Catholic Liturgy. This means that the ordinary of the Mass (how the mass is said) cannot be changed. While popes can add feast days as new saints come into the church, the beliefs and traditions of the Catholic faith cannot change. The only prayers that Jesus Himself instituted into the Mass are the consecration prayers which turn the bread and wine into His body and blood (transubstantiation.) In order for these prayers to be effective they must be said exactly as Jesus intended.
In 1962 the Vatican II Council was convened by Pope John XXIII. When asked why the council was being called he responded, "to open the windows and adjust the church to the modern world." God does not adjust to man, man adjusts to God. What a horrible insult it is to the mater of the whole universe to tell Him that he doesn't know what He's doing and must change all of His ways to suit man. Take a look at the world around you and the state it's in, do you really want to be a part of the world? Not only that, but this statement is in direct contradiction to Christ's words, "If the world hates you, know that it has hated me before you. If you were of the world, the world would love what is it's own. But because you are not of the world, but I have chosen you out of the world, therefore the world hates you." (John: 15 18-19.) God is telling us that if you want eternal life with Him, you must NOT be a part of the world, but God probably doesn't know what He's talking about anyway.
Due to the Vatican II Council Pope Paul VI (who succeeded John XXIII,) used it to change the Mass. Some of the revisions that were made to the Mass are; the change of language from Latin to each counties vernacular, the elimination and change of 75% of the Mass prayers including the offertory and most importantly the revision of the Consecration prayers. The church tells us that if even one word of the consecration prayers are missed or changed it completely invalidates the changing of the bread and wine into the body and blood of Christ (Pope Leo XIII.)
Next in line under the pope is the cardinal who sits at the Holy Office. The purpose of this position is to keep the doctrines and beliefs of the Catholic church from heresies and being changed in any way. At the time Vatican II was convened this position was held by Cardinal Ottaviani. When he voiced his opposition to the counsel he was silenced. He then wrote what is called the Ottaviani intervention. This document stated that Vatican II and the new Mass is "filled with insinuations of heresy and is a radical departure from our Catholic Faith."