From angels and the afterlife to suffering and Divine providence, The God Book addresses all things spiritual through classic works of Jewish philosophy. Works summarized include the Rambams Moreh Nevuchim (Guide for the Perplexed), Ramchals Derech Hashem (Way of God), ibn Pakudas Chovos HaLevavos (Duties of the Heart) and Hilchos Deios from the Rambams Mishneh Torah.

Cuneiform records made some three thousand years ago are the basis for this essay on the ideas of death and the afterlife and the story of the flood which were current among the ancient peoples of the Tigro-Euphrates Valley. With the same careful scholarship shown in his previous volume, The Babylonian Genesis, Heidel interprets the famous Gilgamesh Epic and other related Babylonian and Assyrian documents. He compares them with corresponding portions of the Old Testament in order to determine the inherent historical relationship of Hebrew and Mesopotamian ideas.