The American Catholic theologian Paul F. Knitter (*1939) has reflected intensively on the effects of his dialogue with the religious other on his personal identity as a Christian, particularly in the last two decades. His dialogue with Buddhism and Buddhists finally led him to become a Buddhist-Christian dual belonger. The paper will explore this process of identity transformation as an example of the opportunities offered by interreligious dialogue to expand and deepen one's own religious self-understanding.