Apostolic Letter ‘In Unitate Fidei’: Ecumenical Subversion of Nicaean Orthodoxy
Vatican News portal reports (23 November 2025) that antipope Robert Prevost (“Leo XIV”) issued an apostolic letter titled In Unitate Fidei commemorating the 1700th anniversary of the Council of Nicaea. The document promotes interfaith unity based on the Nicene Creed while downplaying doctrinal differences between Catholicism and “other Churches and ecclesial communities.” Prevost claims the Creed’s “common heritage” enables Christians to be “signs of peace” in a divided world, insisting that “what unites us is much greater than what divides us.” The letter advocates “reconciliation through dialogue” while dismissing theological controversies as obsolete.
Ecumenical Syncretism vs. Catholic Exclusivity
The document’s assertion that “the Nicene Creed can be the basis and reference point for this journey [to unity]” constitutes a fundamental betrayal of Nicaea’s original purpose. The Council condemned Arian heresy not to enable dialogue with error, but to define immutable dogma (Denzinger 54). Prevost’s claim that “the one universal Christian community can be a sign of peace” directly contradicts Pope Pius IX’s condemnation of the error that “Protestantism is nothing more than another form of the same true Christian religion” (Syllabus of Errors §18). The Council of Trent anathematized those claiming “heretics… are not to be considered separated from the Church” (Session VII, Canon 12).
Omission of the Church’s Infallible Magisterium
Nowhere does the letter acknowledge the Council’s establishment of Christ’s visible Church as sole guardian of truth – a silence revealing conciliarism’s apostate foundation. Pius XII’s Humani Generis (1950) condemned the error that “theologians must follow the historical method” rather than the Magisterium (§21). Prevost’s dismissal of theological controversies as having “lost their raison d’être” constitutes explicit Modernism condemned by St. Pius X: “Catholic doctrine admits no evolution that would alter its meaning” (Lamentabili Sane §21, §59).
Naturalism Replacing Supernatural Faith
The document reduces Christianity to a peacekeeping NGO by claiming “the one universal Christian community can be… an instrument of reconciliation.” This naturalization of religion ignores Pius XI’s teaching that “the peace of Christ can only be achieved in the Kingdom of Christ” (Quas Primas §1). The letter’s focus on temporal concerns while omitting any mention of salvation, grace, or the Four Last Things exposes its Marxist underpinnings – condemned by Leo XIII as making “the Church an agency for supplying food and clothing” (Rerum Novarum §26).
Falsification of Historical Continuity
Prevost’s reference to “Saint John Paul II” constitutes blasphemous invocation of a manifest heretic. The true Magisterium consistently condemned ecumenism as “the perverse idea that all religions are more or less good” (Pius XI, Mortalium Animos §2). The claim that “ecumenical dialogue… has led us to recognize the members of other Churches… as our brothers and sisters” directly opposes St. Augustine’s teaching: “Neither heretics nor schismatics belong to the Catholic Church” (De Baptismo Contra Donatistas 1:10).
Sacrilegious Distortion of Christ’s Kingship
By issuing this document on the Feast of Christ the King, Prevost commits theological sabotage against Pius XI’s encyclical instituting the feast. Whereas Quas Primas declared “nations must submit to the authority of Christ” (§19), Prevost reduces Christ’s reign to interfaith sentimentality. The letter’s silence about the Social Reign of Christ the King constitutes tacit endorsement of secularism condemned in the Syllabus of Errors (§77-79).
Conclusion: Apostasy Institutionalized
This document crystallizes the conciliar revolution’s essence: replacement of lex credendi with humanitarian platitudes. As Pope Leo XIII warned, “To neglect the authority of the Church is to neglect God Himself” (Sapientiae Christianae §10). Those clinging to the Vatican II sect must recognize that Prevost’s letter – like all modernist pronouncements – constitutes not Christian teaching but “the synthesis of all heresies” (St. Pius X, Pascendi §39).
Source:
Pope Leo issues Apostolic Letter 'In Unitate Fidei' on Nicaea Anniversary (vaticannews.va)
Date: 23.11.2025