General synonyms:
* Multifaith: This emphasizes the presence of multiple faiths.
* Cross-religious: This highlights the interaction between different religions.
* Pluralistic: This emphasizes the acceptance and respect for multiple faiths.
* Ecumenical: This often refers to cooperation and unity between different Christian denominations, but can be used more broadly to include other faiths.
More specific synonyms:
* Interreligious: This emphasizes the relationships between different religions.
* Interdenominational: This specifically refers to relationships between different Christian denominations.
* Multi-religious: This emphasizes the diversity of religious beliefs.
Other alternatives:
* Religious diversity: This emphasizes the variety of religions.
* Religious pluralism: This emphasizes the acceptance and respect for different religions.
* Dialogue between faiths: This highlights the communication and exchange of ideas between different religions.
The best synonym for "interfaith" will depend on the specific context and the nuance you want to convey.