Very difficult to reconcile modernist Religious Liberty with the previous teaching of the Holy Catholic Church:
Justice therefore forbids and reason itself forbids, the State to be godless; or to adopt a line of action which would end in godlessness, namely, to treat the various religions (as they call them) alike, and to bestow upon them promiscuously equal rights and privileges. Since then, the profession of one religion is necessary in the State, that religion must be professed which alone is true, and which can be recognized without difficulty, especially in Catholic States, because the marks of the truth are, as it were, engraved upon it.
By degrees the religion of Christ was put on the same level with false religions and placed ignominiously in the same category with them.
The Church deems it unlawful to place the various forms of divine worship on the same footing as the true religion, but does not on that account, condemn those rulers, who for the sake of securing some great good of hindering some great evil, patiently allow custom or usage to be a kind of sanction for each kind of religion having its place in the State. And in fact, the Church is wont to take earnest heed that no once shall be forced to embrace the Catholic Faith against his will.
There is no way Religious Liberty can even be reconciled with Church dogma. The Truth of the Catholic religion as an exclusive means of human salvation is not an option, but a certitude and an obligation.
With Religious Liberty what they seek is not conversion to Catholicism but simply convergence and tolerance of error, of falsehood. To supplant what is truly Catholic, divine and heavenly, with what is merely a global common lowest denominator, until there is nothing left from the Authentic Faith of Christ. In the pursuit of Religious Liberty, they forget that the real obstacle is Our Lord Jesus Christ Himself, nonetheless. The Son of God made flesh! The Very Word Incarnate! who cannot be denied by the True Church. There is not possible reconciliation there since this Truth is exclusive.