World Religions › Contemporary › Second Vatican Council
Interfaith dialogue
Nostra Aetate 1965; roots in 1893· Belief or practice· New movements & secular thought
Historical recordConfirmed by archaeology, outside sources or contemporary records.
Organized conversation and cooperation among people of different religions, aimed at mutual understanding rather than conversion.
See it on the World Religions map →What it is
Modern interfaith work traces to Chicago's 1893 World's Parliament of Religions, but it became mainstream after Vatican II's 1965 declaration Nostra Aetate. Milestones include John Paul II's 1986 prayer gathering of religious leaders at Assisi, the revived Parliament of the World's Religions (1993), and the 2019 Document on Human Fraternity signed in Abu Dhabi by Pope Francis and Ahmed el-Tayeb, Grand Imam of Egypt's al-Azhar. Today it ranges from local clergy councils to university programs.
Why it matters
In increasingly mixed societies it gives faiths a way to tackle prejudice, conflict and shared concerns like poverty without asking anyone to give up their beliefs.
Think of it like
Like a tenants' association in a mixed building: residents keep their own units and habits but meet to solve shared problems.
Sources and history
Founding documents such as Nostra Aetate and the Abu Dhabi declaration; records of the Parliaments and Assisi meetings; and research by groups such as Harvard's Pluralism Project.
Questions and debates
Some critics fear it blurs real differences into relativism; others say it rarely reaches the hardliners who most need it.
Inside this (1)
Connections (6)
▸Dalai Lama lineage champions Interfaith dialogueHistorical record
The connection
After fleeing to India in 1959, the 14th Dalai Lama became a leading global voice for interfaith respect. He met Thomas Merton, Popes Paul VI, John Paul II and Benedict XVI, and Jewish leaders, teaching that all major religions share compassion and that people should usually keep their own faith rather than convert.
When and where
Dharamsala and world tours from the 1960s; Merton in 1968; Assisi in 1986; Jewish–Buddhist dialogue in Dharamsala, 1990; Nobel Peace Prize 1989.
Historical evidence
His books, such as 'Toward a True Kinship of Faiths' (2010), recorded meetings and speeches, and accounts like 'The Jew in the Lotus' (1994).
Questions and debates
Some scholars ask whether his universalism reflects traditional Tibetan Buddhism or a modernized version shaped for Western audiences.
▸Bahá'í Faith anticipated Interfaith dialogueMostly agreed by scholars
The connection
Bahá'u'lláh taught that God reveals himself through a series of messengers and that the world's religions are fundamentally one. His son ʻAbdu'l-Bahá spoke in churches and synagogues across Europe and North America in 1911–13. American Bahá'ís started World Religion Day in 1950.
When and where
Ottoman Palestine, 1860s–1890s; ʻAbdu'l-Bahá's tours of 1911–1913; World Religion Day, United States, 1950.
How do we know?
Bahá'u'lláh's writings, newspaper reports of ʻAbdu'l-Bahá's talks, and Bahá'í participation in interfaith bodies.
Questions and debates
Bahá'ís see their faith as the newest revelation, not one equal voice among many, so how it fits interfaith equality is discussed.
▸World's Parliament of Religions launched modern Interfaith dialogueHistorical record
The connection
The 1893 Parliament was the first formal gathering of representatives of Eastern and Western faiths, giving Hindu, Buddhist and Jain voices a Western stage. Its centenary in Chicago in 1993 revived it as a recurring event, where Hans Küng's 'Declaration Toward a Global Ethic' was adopted.
When and where
Chicago, September 1893; John Henry Barrows organized it; the Council for a Parliament of the World's Religions has met since 1993, most recently in Chicago in 2023.
Historical evidence
Published proceedings of 1893, wide press coverage, and the records of the modern Parliaments.
Questions and debates
Historians debate whether 1893 was genuine dialogue or a showcase for liberal Protestantism; Muslims and Native Americans were barely represented.
▸Second Vatican Council opened the Church to Interfaith dialogueHistorical record
The connection
Nostra Aetate (1965), the council's shortest document, said the Church 'rejects nothing that is true and holy' in other religions. It praised Hindu and Buddhist spiritual practice, expressed 'esteem' for Muslims, and rejected blaming Jews for Jesus's death. In 1964 the Vatican created an office for relations with other religions.
When and where
Rome, 1964–65; Pope Paul VI and Cardinal Augustin Bea; the Secretariat for Non-Christians, now the Dicastery for Interreligious Dialogue.
Historical evidence
The text of Nostra Aetate, Vatican office records, and later events such as the 1986 Assisi meeting that built on it.
Questions and debates
How to balance dialogue with the Church's belief that salvation comes through Christ remains debated, as shown by the Vatican's 2000 document 'Dominus Iesus'.
▸Interfaith dialogue often cites The Golden Rule across faithsHistorical record
The connection
Because nearly every faith has a version, the Golden Rule is interfaith dialogue's common ground. The 1993 Parliament of the World's Religions adopted a 'Declaration Toward a Global Ethic', drafted by theologian Hans Küng, calling it an 'irrevocable, unconditional norm'. The 2009 Charter for Compassion puts it at its core.
When and where
Chicago, 1993, at the Parliament's centennial gathering; the Charter for Compassion was launched in 2009 by the writer Karen Armstrong.
Historical evidence
The published declaration texts quote the Golden Rule directly, often citing several religions' versions side by side.
Questions and debates
Critics say reducing faiths to shared ethics can blur real differences in belief; whether a single 'global ethic' is meaningful is debated.
▸September 11 attacks spurred new efforts in Interfaith dialogueMostly agreed by scholars
The connection
After the attacks, as anti-Muslim incidents surged, churches, synagogues and mosques held joint vigils, open houses and study groups. New organizations formed, such as Eboo Patel's Interfaith Youth Core in 2002, and many cities created interfaith councils to counter prejudice and build ties with Muslim neighbors.
When and where
US and worldwide from late 2001; Eboo Patel in Chicago, 2002; local clergy councils in many cities.
How do we know?
FBI data show anti-Muslim hate crimes jumping from 28 in 2000 to 481 in 2001; organizational records document the new groups.
Questions and debates
Whether these efforts changed attitudes broadly or mostly reached people already open is debated, as polls show persistent anti-Muslim prejudice.