For Hegel, thought is not philosophical if it is not also religious. Both religion and philosophy have a common object and share the same content, for both are concerned with the inherent unity of all things. Hegel's doctrine of God provides the means for understanding this fundamental relationship. Although Hegel stated that God is absolute Spirit and Christianity is the absolute religion, the compatibility of Hegel's doctrine of God with Christian theology has been a matter of continuing and closely argued debate. Williamson's book provides a significant contribution to this ongoing discussion through a systematic study of Hegel's concept of God.

The book proceeds by investigating theism, atheism, pantheism, and panentheism as descriptions of Hegel's concept. It rejects the view that Hegel's doctrine so differs from Christian theology so as to be empty of religious content and thereby highlights some important considerations in contemporary theology.