Taking the time to read all of the doctrines and history of the Catholic Church would take the average person years to understand. To even read through the Vatican II documents (there are 16 of them) would also be a challenge for the average Catholic. Here we will try to help you understand some of the heretical changes that Vatican II made to the Catholic faith.
On the Mass page we briefly explained some of the changes that were made to the Mass, here are some more key changes that were made that invalidates the new Mass:
The Mass of the Catechumens (the instruction of the mass,) is the beginning of the Mass through the Credo. While the structure has remained the same the prayers and scriptures have totally changed.
After the mass of the Catechumens the Mass of the faithful begins with the Offertory. Martin Luther (the founder of Protestantism,) when he left the Catholic Church said about the offertory prayers "they stink of sacrifice." The purpose of the offertory prayers are the preparation of the sacrifice of Jesus's life (the cross) for our sins.
Pope Paul VI's idea for the new Mass was to bring all religions together to form one world wide religion (not Catholic.) As a result, the offertory prayers were completely thrown out and replaced with Jewish meal prayers. The offertory prayers said by Vatican II priests today are absolutely not Catholic prayers but are Jewish prayers.
The most important changes made to the Mass (which completely invalidate it) are the changes made to the Consecration prayers, specifically the Mystery of Faith. In Vatican II Masses the Mystery of Faith is, "Christ has died, Christ has risen, Christ will come again." This is not the mystery of faith taught by the Catholic Church and never has been. The Mystery of Faith is the changing of the bread and wine into the Body and Blood of Christ. By removing the Mystery of Faith from the consecration formula to outside of the consecration, it invalidates the changing of the bread and wine into the Body and Blood of Christ. While the consecration formula of the bread remains the same, it takes both formulas to complete the total validity of the consecration. The end result is that when you receive Holy Communion in the new Mass you are not receiving the Body and Blood of Jesus.
It is also forbidden for anyone other than a priest to touch the Sacred Host, a common practice in the new Mass today.
St. Thomas Aquinas is considered to be the Father of Catholic Theology. For centuries St. Thomas Aquinas's theology was the required teaching in all monasteries and seminaries (Council of Trent.) The Vatican II revolution
has eliminated the teachings of St. Thomas and replaced them with modern heretical theologians which Pope Pius XII condemned.
These are just a few examples of the many heretical changes brought to the Catholic Faith by Vatican II.