This searching, profound comparative history of the three major monotheistic faiths fearlessly illuminates the sociopolitical ground in which religious ideas take root, blossom and mutate. Armstrong, a British broadcaster, commentator on religious affairs and former Roman Catholic nun, argues that Judaism, Christianity and Islam each developed the idea of a personal God, which has helped believers to mature as full human beings. Yet Armstrong also acknowledges that the idea of a personal God can be dangerous, encouraging us to judge, condemn and marginalize others. Recognizing this, each of the three monotheisms, in their different ways, developed a mystical tradition grounded in a realization that our human idea of God is merely a symbol of an ineffable reality. To Armstrong, modern, aggressively righteous fundamentalists of all three faiths represent ``a retreat from God.'' She views as inevitable a move away from the idea of a personal God who behaves like a larger version of ourselves, and welcomes the grouping of believers toward a notion of God that "works for us in the empirical age.''