Multiple religious belonging, also known as double belonging, refers to the idea that individuals can belong to more than one religious tradition. While this is often seen as a common reality in regions such as Asia with its many non-exclusionary religions, religious scholars have begun to discuss multiple religion belonging with respect to religious traditions such as Judaism, Christianity, and Islam.

Comparative theology is a relatively new discipline within theology, which holds together "comparative" and "theology" in creative tension. It represents a particular type of theological practice committed to deep interreligious learning ("comparative") while staying rooted in a particular religious tradition ("theology"). Moreover, while many of its proponents come from the Christian religious tradition, it can have as a starting point the theology of any religious tradition.