I take the term 'Judeo/Christian' to mean the shared common, moral values of Judaism & Christianity: both worship the same God, use the Torah (Old Testament) & the Ten Commandments - as opposed to Islam.
A common notion/belief is that the "3" monotheistic religions (Islam is not a true religion) worship the same god. They do not. Jews & Christians worship the God of the Bible; Islam worships a fictitious moon "god", nicknamed Allah. The attributes of Allah in no way resemble the triune God of the Bible.