@realjohnboy,
Multiple meanings:
The earliest uses cited by the Oxford English Dictionary of the terms "Judeo-Christian" and "Judeo-Christianity" date to 1899 and 1910 respectively. Both terms appeared in discussions of theories of the emergence of Christianity, and with a different sense than the one common today. "Judeo-Christianity" here referred to the early Christian church, whose members were Jewish converts and still considered themselves part of the Jewish community.
However, earlier German use of the term "Judeo-Christian"—in a decidedly negative sense, contrasting with the one prevalent in the twentieth century—can be found in the late writings of Friedrich Nietzsche, who emphasized what he saw as neglected aspects of continuity between the Jewish world view and that of Christianity. The expression appears in The Antichrist, published in 1895 and written several years earlier; a fuller development of Nietzsche's argument can be found in a prior work, On the Genealogy of Morality.
The present meaning was for the first time used on 27 July 1939 with the phrase "The Judaeo-Christian scheme of morals" in the New English Weekly. The term gained much greater currency particularly in the political sphere from the 1920s and 1930s, promoted by Liberal groups which evolved into the National Conference of Christians and Jews, to fight antisemitism by expressing a more inclusive idea of the United States of America than the previously dominant rhetoric of the nation as a specifically Christian Protestant country; By 1952 President Elect Dwight Eisenhower was speaking of the "Judeo-Christian concept" being the "deeply religious faith" on which "our sense of government…is founded."
The term became particularly associated with the Conservative Right in American politics, promoting a "Judeo-Christian values" agenda in the so-called culture wars, a usage which surged in the 1990s. Hot topic issues in the battles over the Judeo-Christian tradition include, in a typical example, the right to display the following documents in Kentucky schools, after they were banned by a federal judge in May 2000 as "conveying a very specific governmental endorsement of religion":
an excerpt from the Declaration of Independence, which reads, "All men…are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of happiness"
the preamble to the Constitution of Kentucky, which states, "We, the people of the Commonwealth of Kentucky, grateful to Almighty God for the civil, political and religious liberties we enjoy, and invoking the continuance of these blessings, do ordain and establish this Constitution"
the national motto, "In God we trust"
a page from the congressional record of Wednesday, February 2, 1983, Vol. 129, No. 8, which declares 1983 as the "Year of the Bible" and lists the Ten Commandments
a proclamation by President Ronald Reagan marking 1983 the "Year of the Bible"
a proclamation by President Abraham Lincoln designating April 30, 1863, a "National Day of Prayer and Humiliation"
an excerpt from President Lincoln's "Reply to Loyal Colored People of Baltimore upon Presentation of a Bible," which reads, "The Bible is the best gift God has ever given to man."
The Mayflower Compact, in which the colony's founders invoke "the name of God" and explain that their journey was taken, among other reasons, "for the glory of God and advancement of the Christian faith"Prominent champions of the term also identify it with the historic Pilgrim–Puritan Protestant tradition. The Jewish Conservative columnist Dennis Prager, for example, writes:
The concept of Judeo-Christian values does not rest on a claim that the two religions are identical. It promotes the concept there is a shared intersection of values based on the Hebrew Bible ("Torah"), brought into our culture by the founding generations of Biblically oriented Protestants, that is fundamental to American history, cultural identity, and institutions.
Liberal secularists reject the use of "Judeo-Christian" as a code-word for a particular kind of Christian America, with scant regard to modern Jewish, Catholic or more liberal Christian traditions.
Usage has shifted again, according to Hartmann et al., since 2001 and the September 11 attacks, with the mainstream media using the term less, in order to characterize America as multicultural. The study finds the term now most likely to be used by Liberals in connection with discussions of Muslim and Islamic inclusion in America, and renewed debate about the separation of church and state.
It is used more than ever by some Conservative thinkers and journalists, who use it to discuss the Islamic threat to America, the dangers of multiculturalism, and moral decay in a materialist, secular age. Dennis Prager, author of popular books on Judaism and antisemitism, Nine Questions People ask about Judaism (with Joseph Telushkin) and Why the Jews? The Reason for Antisemitism, and radio commentator, has published an on-going 19-part series explaining and promoting the concept of Judeo-Christian culture, running for three years from 2005 to 2008, reflecting the interest of this concept to his listeners. He believes the Judeo-Chrisitan perspective is under assault by an amoral and materialistic culture that desperately needs its teachings.