At the core of Stark's investigation is his argument that specific ideas innate to Judaism (especially that found in Diaspora Jewish communities) and Christianity played a pivotal role in enabling the West to make and sustain political, legal and economic breakthroughs that eluded other civilizations. First and foremost, Jews and Christians viewed God as a rational Creator. In that sense, God was not at all like the Greco-Roman deities — capricious, self-indulgent beings for the most part. Moreover, the Christians, from the very beginning, not only understood the need to reason out the implications of Christ's teachings; they also viewed reason as the great gift which God gave man to know the truth about the Creator but also the world He created in order that humans might help unfold God's design.
The second religious ingredient of the West's success, Stark maintains, was Christianity's unwillingness to attribute life's ups-and-downs to fate. Unlike the pagan (and many contemporary) religions, the Jewish and Christian "conception of God is incompatible with fate" (p. 120). It is true, Stark writes, that particular pagans such as Cicero had a somewhat similar view of free will. The difference is that belief in free will was more than simply a philosophical tenet for Jews and Christians. It was also a matter of specific religious conviction, which meant, furthermore, that people could — and would — be held accountable for their free choices before the same rational God who had given them free will.