One Church ✧ Ukrainian Orthodox Initiative for Christian Unity

Islam in Iran: History, Society, and the Theological Dimension

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Islam in Iran is not only the religion of the majority of the population, but also the foundation of state identity, the political system, and public morality. Unlike most Muslim countries, where the Sunni tradition predominates, Iran is the main center of Twelver Shiism—a theological and spiritual current that has shaped a distinctive type of religious-political order.

A Brief History of the Orthodox Church of Ukraine

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The history of the Orthodox Church of Ukraine as the restoration of the Kyiv Metropolis: a canonical perspective, key events from 988 to the autocephaly of 2019, and their ecclesial significance.

Declaration Dominus Iesus

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Declaration Dominus Iesus on the unicity and salvific universality of Jesus Christ and the church.

The Holy Fathers of the Church on the Primacy of the Apostle Peter and the Roman Church

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One of the main questions dividing Orthodox and Catholics today is the issue of the primacy of the Pope of Rome — the primacy of the Apostle Peter and his successors in the Church. We present to our readers a list of quotations from the writings of the Fathers of the Church of the first millennium, in which the primacy of the Apostle Peter and his See — the Church of Rome — is considered.

The Catholic Church’s View of Islam According to Nostra Aetate

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The Catholic Church recognizes Islam as a monotheistic faith that honors God, Jesus, and Mary, promoting dialogue and mutual respect according to Nostra Aetate.

The Teaching of the Catholic Church on Judaism

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Lecture by Fr. Peter Hocken on the Catholic Church’s teaching on Judaism, from Vatican II to the Catechism, Israel’s calling and the mystery of salvation.

Apostolic Letter Egregiae Virtutis

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Apostolic Letter Egregiae Virtutis of the Supreme Pontiff John Paul II Proclaiming Saints Cyril and Methodius Co-Patrons of Europe.

The Ukrainian Orthodox Church of the Moscow Patriarchate

Resolutions of the Council of the Ukrainian Orthodox Church of May 27, 2022

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The resolution of the Council of the Ukrainian Orthodox Church of the Moscow Patriarchate dated May 27, 2022, proclaims full canonical independence and declares the UOC-MP to be a fully self-governing Local Church of Ukraine.

Christian meaning of Halloween

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Halloween wasn’t always about ghosts and candy. Long before it became a night of costumes and fright, it was All Hallows’ Eve—a sacred vigil of light before the Feast of All Saints. Rooted in Christian tradition, it reminded believers that death is not to be feared but faced with faith, for life in Christ conquers the grave. Today, beneath the masks and modern festivities, traces of that ancient message still remain—inviting us to rediscover the holy night hidden within the holiday.