This research project tries, for the first time, to analyze and compare all the key Spanish Jewish apostates, especially Petrus Alfonsi, Abner of Burgos, Geronimo de Santa Fe, Pablo de Santa Maria and Pedro de la Caballeria. The aim of this research is to understand the ideological background of the mass conversion of the Spanish Jewish community from the perspective of the intellectual elite involved in the conversion itself and not – as has usually been the case in modern scholarship – according to the rabbis who decided to stay Jewish. In the first part of the book, the author explains the impact of the conversion of a part of the Jewish intellectual elite on the Spanish Jewish population. In the second part, he examines the opinion of the various ideological converts regarding Christianity (especially the dogmas of the Trinity and Incarnation). In the third part, he analyzes their criticisms of Judaism. The main conclusion of this research is that there is a very important difference between the various converso intellectuals regarding the essence of Christianity. The conversos who were philosophers or kabbalists before their conversion continued with a similar approach even after their conversion, using their former philosophical/kabbalistic knowledge to try to convince their fellow Jews to convert as they had. The common denominator of the different writings of these apostates is not their opinions on Christianity but rather their similar criticisms of Judaism, and especially with regard to keeping Jewish religious obligations.
