The term interfaith dialogue refers to cooperative, constructive and positive interaction between people of different religious traditions (i.e., "faiths") and/or spiritual or humanistic beliefs, at both the individual and institutional levels. It is distinct from syncretism or alternative religion, in that dialogue often involves promoting understanding between different religions to increase acceptance of others, rather than to synthesize new beliefs.
Throughout the world there are local, regional, national and international interfaith initiatives; many are formally or informally linked and constitute larger networks or federations. The often quoted "There will be no peace among the nations without peace among the religions. There will be no peace among the religions without dialogue among the religions" was formulated by Dr Hans Küng, a Professor of Ecumenical Theology and President of the Foundation for a Global Ethic.
The United States Institute of Peace published works on interfaith dialogue and peacebuilding including a Special Report on Evaluating Interfaith Dialogue Interfaith dialog forms a major role in the study of religion and peacebuilding.
To some, the term interreligious dialogue has the same meaning as interfaith dialogue. Neither are the same as Nondenominational Christianity. The World Council of Churches, though. distinguishes between 'interfaith' and 'interrreligious.' To the WCC, 'interreligious' refers to action between different Christian denominations. So, 'interfaith' refers to interaction between different faith groups such as Muslim and Christian or Hindu and Jew for example.
Read more about Interfaith: History, Interfaith Organisations, United Nations Support, Criticism of Interfaith Dialogue