Certainly the most debated event of the 20th century was the Second Vatican Council. In this FAQ video—Episode 8 of Our Catholic Faith Today series—we will answer the question: What is the Second Vatican Council?
This video will explain about the Modernist revolution introduced into the Catholic Church through the Vatican II's four sessions that began in 1962 under Pope John XXIII and ended during the pontificate of Pope Paul VI in 1965.
The Second Vatican Council was the 21st ecumenical council of the Catholic Church and had the greatest number of attending bishops—over 2000. In opposition to all of the prior ecumenical councils though, Vatican II was declared to be "pastoral", which would not make any infallible statements. In the wake of the Council though, the liberals falsely asserted that Vatican II was dogmatic, particularly concerning the Modernist errors it introduced, such as ecumenism, collegiality, and religious liberty.
The post-conciliar era has also witnessed the introduction of the so-called "Spirit of Vatican II" which includes a liberal interpretation of the Church's immutable teachings and morals. This has led to the creation of a New Liturgy and sacramental rites, a New Code of Canon Law, and a New Catechism, all of which are infected with Modernist errors.