In the 1950s historian Arnold Toynbee made the argument that Jews and Judaism did not fit into any definition of nation, race, or religion. We were not a nation because we lived for centuries without a land and our people were scattered throughout the world. We were not a race because we accepted converts. And we were not solely a religion because we counted among our numbers people who do not believe in G-d. But given the Jewish presence in world history for more than 3000 years, he classified us as a "fossil." His comment led to a famous debate with Yaakov Herzog. Did any of the great post-Holocaust sages publish a response as well?
Prof. Eliezer Berkovits wrote a book in response called "Judaism: Fossil or Ferment?." In his recent Erasmus Lecture, Rabbi Jonathan Sacks responded to Toynbee's critique of Judaism (starting at 25 min.)