There is No "Judeo-Christianity"
There is no such thing as Judeo-Christianity. But there are groups of people who
are deeply and violently dedicated to convincing you, and the world at large, that there is. And with this comes the death of Judaism and the death of Jewish people, so what must come first is the eradication of the terminology, “Judeo-Christian”.
Christian supersessionism, or replacement theology, is an inherently antisemitic Christian belief that posits that Christianity fulfilled and “replaced” the covenant of the Jews with G-d, thereby making Judaism, and Jews, obsolete. All Jews are wayward sheep following a dead creed who must be brought to the shepherd (Jesus) by whatever means necessary. Cultural genocide included.
To be clear: not all Christians adhere to this belief. However, those who do are a vocal, powerful group, many of whom hold seats of influence in government agencies and organizations across the globe. Those who do believe this are a powerful, vocal, and violent group. If the shoe does not fit, do not wear it--instead, aid in protecting those who will be hurt by that group. Again: if you or a loved one is a Christian, but does not adhere to the beliefs of supersessionism, then this is not about you or them.
History of the Term
The first documented use of the term is in a letter from October 17, 1821, by Irish missionary, Alexander McCaul, whose life's work was dedicated to converting Jews to Christianity. It was, however, used to specifically refer to Jewish converts to Christianity.
"From all I can see there is but one way to bring about the object of the Society, that is by erecting a Judæo Christian community, a city of refuge, where all who wish to be baptized could be supplied with the means of earning their bread."
Judeo-Christian Does Not Exist
The modern use of the term is another step in the grand evolution of Christian erasure of Jews; a faux inclusion while speaking over and erasing Jews, all the while muddling, obscuring, and hiding Jews and our very different beliefs from the narrative. Most people using this term have an agenda and that agenda serves the needs of the Christian majority--Jews and our beliefs be damned.
https://www.jewitches.com/post/no-judeo-christianity