Final answer:
Peter Enns would likely exclude the notion of the Old Testament deity as an 'All Perfect Being' from the primary and essential starting points for constructing a valid Old Testament theology.
Step-by-step explanation:
The question asks which element Peter Enns does not consider a primary and essential starting point for constructing a valid Old Testament theology. While the specific views of Enns are not directly provided in the references, we can infer from the gathered information that Enns would likely refute the idea of the Old Testament deity being an 'All Perfect Being.' The Old Testament presents a deity with attributes and actions that can be perceived as having weaknesses, such as jealousy or vindictiveness.
According to some scholars, traditional views of an all-knowing, all-powerful and all-good deity are challenged by stories in the Hebrew Bible. Enns may argue that constructing a valid Old Testament theology would require recognizing this complexity, rather than beginning with a presupposition of perfection that is more aligned with later theological developments influenced by Greek philosophy.