Christ established one Church, not a confederation of equally legitimate expressions of Christianity.
The modern ecumenical movement, particularly in its post-conciliar manifestation, has adopted a dangerous illusion: that the various Christian denominations represent equally valid paths to God, differing merely in accidental rather than essential characteristics. This irenic approach, pursued with increasing fervour since the Second Vatican Council, fundamentally misunderstands the nature of the Church established by Christ; the Catholic Church, built sub Petro et cum Petro. Pope Pius XI, in his 1928 encyclical Mortalium Animos, provided a prophetic critique of this very tendency, warning against a false irenicism that would compromise the integrity of Catholic truth for the sake of a superficial unity. Nearly a century later, his warnings remain not only relevant but crucial, as the fruits of the ecumenical project have proven meagre while the confusion sown among the faithful has grown exponentially.
The central problem plaguing contemporary ecumenism is its implicit acceptance of ecclesiological relativism. By treating separated Christian communities as though they possessed equal claims to authenticity, the movement obscures the fundamental Catholic teaching that the Church of Christ subsists in the Catholic Church in its fullness. This is not mere triumphalism but theological necessity. Christ established one Church, not a confederation of equally legitimate expressions of Christianity. When you dilute doctrine for the sake of getting along, you’re not building bridges; you’re building a house on sand and calling it interfaith cooperation.
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