There is one thing and one thing alone that distinguishes Christianity, Judaism, and Islam from all other world religions: they all trace themselves back to the same person, Abraham. For all three of these religions, the connection to the patriarch, Abraham is a central part of their identity. These three religions, unique among all others, consider themselves in some sense deriving from Abraham.
The Jewish theologian Peter Ochs has often highlighted the importance of the common Abrahamic heritage of these three faiths in his dialogues with John Howard Yoder and in his response to 9/11. If there is any theologian who takes the issue of “Abrahamicity” seriously in terms of inter-religious dialogue, it is him.
Here is my question: what theological significance, if any, does the common Abrahamic heritage of Judaism and Islam have from a Christian theological perspective? Clearly we cannot think about Judaism and Islam the same way we think about, say, Hinduism. At some level our stories are connected. What theological difference does this connection make?