Jews were always included under the rubric of the “Judeo-Christian tradition”. It was kind of a delicate arrangement. The convention was always that ceremonial expressions of religious sentiment restricted themselves to mentions of “God” or “The Lord”. We had Bible readings in school, but only from the Old Testament, which was supposed to keep the Jews happy, but as kids we didn’t worry about them too much. The big schism was between Protestants and Catholics. All this was accepted in the 1950’s as “the way things were”.
Well, I wasn't born till the 60's so I got in after the cutoff. :P