Where Judaism Differed: An Inquiry into the Distinctiveness of Judaism

This fine volume is exactly what it sounds like: an extended discussion of the features that make Judaism unique. If you're interested in this topic and if this book ever returns to print, buy it at once -- and in the meantime, pick up a used copy.

Abba Hillel Silver (an American Reform rabbi probably best known for his staunch support of Zionism when it wasn't fashionable) takes the reader on a grand tour of Judaism's distinguishing features, comparing it not only with Christianity but also with Hinduism, Buddhism, and Taoism where these are relevant. Mainly, though, this volume is a positive portrait of what Judaism has historically stood for.