Naturalism, or theistic naturalism, is the main theological orientation of the philosophy of Astronism holding a firm belief in the existence of God or a creator of the universe. In the Millettic cosmology, this all-creating entity or realm is referred to as The Divine. However, unlike other theistic systems, naturalism does not expound a belief in the existence of an afterlife, and by extension, nor does it state that there exists any connection between good and bad acts conducted by humans in their lives being rewarded or punished in their afterlife. 

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Naturalism therefore presents a unique, yet divergent theological system that emphasises the ambiguity of God whilst simultaneously placing a greater focus on natural phenomena, particularly cosmic phenomena and progeny in the context of Astronism rather than notions of revelation or supernatural experiences that have informed other theological systems.

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In the true spirit of philosophy, Astronism also acknowledges the existence of two other forms of naturalism, the first being atheistic naturalism and the second being non-theistic naturalism, which also constitute considerable portions of its theological system. It is important to understand that although Astronism holds certain beliefs as central to its system of thought, alternate beliefs to those which are most predominantly held are not shunned for Astronism remains a philosophy, which means that there exists no dogma or doctrine that outcasts ideas that are not in alignment with the established narrative. Therefore, atheistic naturalism and non-theistic naturalism enjoy considerable prevalence in Astronism despite them being less popular than the established belief of theistic naturalism.  

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Atheistic naturalism believes neither in the existence of a creator God, yet nor does it believe in the existence of an afterlife meanwhile non-theistic naturalism considers the question of the existence of a God or the afterlife to be irrelevant and that only the present reality and that which is observable known, such as cosmic progeny and phenomena, should be factored into theological systems.