3.16. Isn’t the Church infallible in her doctrine, liturgy, and discipline? How can she produce errors?

Yes — when acting with her full authority, the Church is infallible in faith and morals. However, Vatican II explicitly disclaimed infallibility, and thus its novel teachings are not protected by the Holy Ghost.

The Church cannot defect, but individuals who usurp her offices can promote errors. The post-Vatican II hierarchy does not represent the true Church, because it proposes doctrines and practices that contradict Catholic Tradition.

As Pope Paul IV taught, a heretic cannot hold office in the Church — not even the papacy (Cum ex Apostolatus Officio, 1559).