This is a revolutionary book based on the premise that a significant factor in the monotheism of Judaism, Christianity, and Islam is Persian Zoroastrianism. The book includes the full texts of the Torah, New Testament, and Quran, with excellent introductory and connective essays. First, the authors have to redate Zoroaster to the 5th century BCE. The previous orthodoxy on this question made him considerably earlier. Then there is the idea that Zoroaster had some kind of contact with the Jewish exilic community in Babylon, where they resonated with a common monotheism. The Persian conquest sent the Jews back to Jerusalem with the unique blessing of Cyrus. The Persians, of course, were Zoroastrian, and their influence pervaded the whole region. The thesis is that there was this cross fertilization that influenced the editing of the Torah. The book makes a case for Jesus legendary traveling to India, or at least Babylon, Persia, or just picking up Zoroastrian ideas in Syria. Then Mohammad, centuries later, also had some Zoroastrian connections. Finally, we have actual writings of Zoroaster, which do reflect many themes that appear in the three Abrahamic faiths. It's a fun book with lots of new ideas. They're not going for a blending of these religions in which differences are dissolved, but pointing out that there are deep connections and commonalities here. They even make the assertion that Zoroaster may have influenced Gautama in India. Thus every major religious development in the region is tied together. Cool book. Moves towards interfaith understanding.