The Resurrection of the Roman Catholic Church

For nearly twenty centuries, the Roman Catholic Church withstood all the currents of change and history and maintained a closely guarded orthodoxy which has always served as the basis and center of all Christianity. Yet, it is as if all of that has been just arbitrarily swept away in the few years since Vatican II. Given what the Church has always taught about itself being indefectible, how could this have happened? Did that Council have something to do with that terrible loss of faith? Can the