 Another response to the challenge that panentheism lacks a distinctive characteristic recognizes the diversity of types of panentheism and similarities between some other forms of theism and panentheism (Olson 2020 [Other Internet Resources]; Birch 1998; Gustafson 2011). This diversity of panentheism and the similarities to other forms of theism requires identifying panentheism by means of more than single characteristic (Lataster and Bilimoria 2018, 57–58). Several suggestions about ways to identify the commonality among the diverse expressions of panentheism and similar forms of theism have been made. Michael Brierley finds eight common themes in panentheism although all eight themes may not be present in each expression of panentheism (2004, 6–8). Gregersen identifies a core common to all forms of panentheism, God contains the world so that the world belongs to God and there is a feeding back from the world into divine life (2017, 582). This common then is expressed in a variety of forms of panentheism as particular theologies (Gregersen 2017, 583). Stenmark describes panentheism as having core doctrines and extension claims (2019, 23). Panentheism and classical theism share extension claims that God is the creator of the world and that continued existence of the world depends upon God’s ongoing creative activity. Both panentheism and classical theism maintain the immanence of God, but they differ in that panentheism holds that God ontologically includes the world while classical theism maintains an ontological distinction between God and creation. For Stenmark, the core claims of panentheism are that God ontologically includes the world and that God depends on the world for God’s own existence (2019, 25–26). Clayton suggests that panentheism be considered a philosophical research program which may include sub-research programs. The panentheistic research program affirms the pervasiveness of change with real change taking place in the divine experience but not in the divine nature. Since panentheists differ on whether creation is from nothing or is necessary this is a sub-research program within panentheism (Clayton 2019, 9–10).