Michael Levine's book is the first comprehensive study of pantheism as a philosophical position. Spinoza's Ethics, finished in 1675, has long been seen as the most complete attempt at explaining and defending pantheism. Historically, however, pantheism has numerous forms and Spinoza's version is best considered as one among many variations on pantheistic themes. Levine manages to disentangle the concept from Spinoza; this book is a broad philosophical and historical survey of pantheism itself.

There is much confusion about what pantheism, this "form of ... non-theistic monotheism," actually is. The early part of the book deals with definitions of pantheism and examines critical distinctions between them. Chapter 2 is an analysis, both historical and contemporary, of the concept of pantheism. What is "unity" in pantheism's "all-inclusive divine unity"? Pantheism is compared to theism in Chapter 3.

In Chapter 4 an account is presented of how some philosophical problems usually associated with theism are to be recast in pantheism and how, if at all, they might be resolved. The later chapters discuss the relationship between belief and practice. What are the religious implications of pantheism in terms of practice? Are there grounds - both philosophical and religious - for believing that pantheism presents the genuine alternative to theism that many contemporary non-theists think it does?