Good question. I looked at wiki pedia the depository of knowledge on the streets of the common politically correct man: "The current American use of "Judeo-Christian" — to refer to a value system common to Jews and Christians — first appeared in print in a book review by the English writer George Orwell in 1939, with the phrase "the Judaeo-Christian scheme of morals." Orwell's usage of the term followed at least a decade of efforts by Jewish and Christian leaders, through such groups as the National Conference of Christians and Jews (founded in 1927), to emphasize common ground. The term continued to gain currency in the 1940s. In part, it was a way of countering antisemitism with the idea that the foundation of morals and law in the United States was a shared one between Jews and Christian"