What false doctrine does it teach concerning religious liberty?
The teaching of Vatican II on religious liberty, contained in Dignitatis Humanae, nearly word for word asserts the very doctrine which was condemned by Pope Pius VII in Post Tam Diuturnas, by Pope Gregory XVI in Mirari Vos, by Pope Pius IX in Quanta Cura, and by Pope Leo XIII in Libertas Praestantissimum. The teaching of Vatican II on religious liberty also contradicts the royalty of Jesus Christ in society as expressed in Quas Primas of Pope Pius XI, and the constant attitude and practice of the Church with regard to civil society.