Considering mistake in the question, you forget to add U.S. in the question;
It is True that, the concept of agreement between man and god had influenced greatly the early colonists in U.S.,
It is said that, this term, Judeo-Christian, had first appeared around the 19th century, and was used to represent Jewish converts to Christianity.
This term had been also used widely during the cold-war period to represent an unified American community in opposition to communism.
A prominent historian, K. Gaston, had acknowledged that this term was used as to represent U.S. in the 1930s, as a unified cultural identity and distinguishing itself as in opposition to the fascism and communism.
In the 1930s, the Nazi anti-semitism had made the Catholics, protestants and Jews to stress on increasing tolerance and understanding towards each other's faiths.
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