Book excerpt: In Children of the Same God, Susan J. Ritchie makes the groundbreaking historical argument that, long before Unitarianism and Universalism merged in the United States, Unitarianism itself was inherently multireligious. She demonstrates how Unitarians in Eastern Europe claimed a strong affinity with Jews and Muslims from the very beginning and how mutual theological underpinnings and active cooperation underpin Unitarian history but have largely disappeared from the written accounts. With clear implications for the religious identity of Christians, Jews, and Muslims as well as Unitarian Universalists, and especially for interfaith work, Children of the Same God illuminates the intertwining histories and destinies of these traditions.