same with "judeo-christian". In the 19th century it was a term to describe Jews who converted to Christianity. That's it. Wasn't talking about any overarching joint Christian-Jewish shared culture or anything like that.

It wasn't used in its modern context until the 1930s, when it was invoked heavily by FDR to combat anti-semitism of the Nazis. So the very first use of it was against other Christians, to try and create a united home front that included Catholics, Protestants and Jews. It was never put away because it became a useful tool of anti-communists and zionists, who fearmongered about "irreligion" and atheistic communism coming for them - and to get Christians to join the Zionist cause. It became increasingly Islamophobic and used as a bludgeon against Islam specifically after the Cold War and during the war on terror.

It's not this thousand years old shared tradition of values. Jews and Protestants and Catholics went through periods of bitter hatred and also mostly peaceful coexistence all around the world, but they never considered themselves all under the same umbrella until the modern age Liberalism and Zionism forced them into a group that is incoherent in almost all ways except that it has utility for white supremacy and American imperialism.