Possible Naturalistic Explanations
There are fine tuning arguments that are naturalistic. As modern cosmology developed, various hypotheses have been proposed. One is an oscillatory universe or a multiverse, where fundamental physical constants are postulated to resolve themselves to random values in different iterations of reality. Under this hypothesis, separate parts of reality would have wildly different characteristics. In such scenarios, the issue of fine-tuning does not arise at all, as only those "universes" with constants hospitable to life (such as what we observe) would develop life capable of contemplating the question of the origin of fine-tuning.
Based upon the Anthropic principle, physicist Robert H. Dicke proposed the "Dicke coincidence" argument that the structure (age, physical constants, etc.) of the Universe as seen by living observers is not random, but is constrained by biological factors that require it to be roughly a "golden age".
Read more about this topic: Fine-tuned Universe
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