The "Judeo-Christian" religious phenomenon coexistence of cultures had two forms: first, to Jewish converts to Christianity continued to observe its rites and placed their beliefs in the sole context of the Old Testament; Later, in the sixth and seventh centuries, when the civil power, on behalf of the state religion, forced the Jews to convert to Christianity.
If at first Christianity was indebted to the convictions of Judaism of the first century AD, all subsequent history is that of a fruit detached from the branch that held it. His willingness to be distinguished from Judaism takes two ways: with allegory, appropriates the book of Judaism, the Old Testament, and justification to consider precursor of the New; with dogmatic formulation, the Church presents the believer eventually a set of beliefs that this should accept input proposing the "conversion" a new order of realities.
Judaism and Christianity are not a whole because both religions are outward relative to the other, although the second follow up to the first: rub shoulders but not confused. Javier Teixidor examines their relationship and their differences at certain times in history, not only what they were in the early centuries, but above all, which accounted for later in the modern and contemporary periods, paying particular attention to the question of Semitism. And draws on the work of thinkers and writers such as Moses Mendelssohn, Franz Rosenzweig, Marcel Proust or Hannah Arendt.