 These religious groups were classified by Pember as modern-day heresies.Pember's interpretation of the Spiritualist churches and of the Theosophical Society as prophetic signs of anti-Christian spiritual deception represents a nineteenth-century style of argument that has been subsequently developed and refined in Christian Countercult literature.As Pember's book defends the creation account of Genesis and rejects Darwinian evolutionary theory it is a work of Christian apologetics, and the latter part of the book is an early example of that genre of literature produced in evangelical Countercult apologetics.