What Does Interfaith Mean? A Comparative Look at Judaism, Christianity, and Islam

In Jewish thought, the concept of interfaith engagement is shaped by a foundational concern for maintaining the distinctiveness of Israel's covenant relationship with God. The Torah instructs the community to put difference between holy and unholy Leviticus 10:10, a principle that has historically informed Jewish caution about blurring religious boundaries. This doesn't mean hostility toward outsiders, but it does mean that interfaith relationships are approached with careful theological intentionality.

Modern Jewish interfaith dialogue, particularly after the Holocaust and the founding of the State of Israel, has grown significantly. Scholars like Rabbi Joseph B. Soloveitchik (writing in 1964) argued that Jews could engage in dialogue on humanitarian and ethical matters with people of other faiths, while remaining reserved about purely theological debates. The tradition's emphasis on tikkun olam (repairing the world) provides a practical bridge for cooperation across faith lines without requiring doctrinal compromise Leviticus 10:10.

Christianity holds an inherent tension at its core when it comes to interfaith engagement. On one hand, the New Testament calls believers to "fervent charity" — a deep, active love — directed toward all people 1 Peter 4:8. This impulse has driven centuries of humanitarian cooperation across religious lines and underpins much of modern ecumenical and interfaith movement. The idea that those who are sanctified are "all of one" origin points toward a shared human dignity Hebrews 2:11.

On the other hand, Paul's letters contain pointed warnings. He asks rhetorically, "what fellowship hath righteousness with unrighteousness?" 2 Corinthians 6:14, and further challenges believers with "what concord hath Christ with Belial?" 2 Corinthians 6:15. These passages have led many conservative Protestant theologians — including John MacArthur in the 20th century — to argue that deep spiritual partnership with non-Christians is theologically problematic, even if civil cooperation is acceptable.

Mainstream Catholic and mainline Protestant traditions, however, especially since the Second Vatican Council (1962–1965), have embraced interfaith dialogue as a Christian duty rooted in love and shared humanity. The word of God, when heard and kept Luke 11:28, is understood to call Christians outward in humble engagement rather than isolation.

Islam's approach to interfaith meaning is grounded in the conviction that all of humanity is ultimately accountable to the one God, Allah. The Quran states plainly — "By your Lord, We will surely question them all" Quran 15:92 — affirming that no community, regardless of religious label, escapes divine scrutiny. This universalism creates a theological basis for taking other faiths seriously, since all people stand before the same Creator.

Classical Islamic jurisprudence recognized the category of Ahl al-Kitab (People of the Book), which includes Jews and Christians, as communities with whom Muslims could engage in trade, marriage (in certain circumstances), and civil life. Modern scholars like Tariq Ramadan and Seyyed Hossein Nasr have argued that Islam's rich tradition of pluralistic coexistence — particularly during the Andalusian period — provides a strong historical model for contemporary interfaith dialogue. Interfaith, in the Islamic frame, doesn't mean relativism; it means recognizing shared moral accountability before God Quran 15:92.