The following is Robin Collins’ fine-tuning argument for the existence of a fine-tuner I used in the VT debate on the existence of God.  This version of the fine-tuning argument is an abductive version.  I believe this argument, when used in an abductive form, is the strongest form of the argument.  You’ll usually see it in a deductive form, a la William Lane Craig.  For my method of argumentation please see: VT–My Method of Argumentation.

The fine-tuning argument argues that when the physics and the laws of nature are expressed mathematically their values are ever so balanced in a way that permits the existence of life.  This claim is made on the basis that existence of vital substances such as carbon, and the properties of objects such as stable long-lived stars, depend rather sensitively on the values of certain physical parameters, and on the cosmological initial conditions.[1]  I’m merely arguing that the universe/multiverse is fine-tuned for the essential building blocks and environments that life requires for cosmic and biological evolution to even occur.

1. Given the fine-tuning evidence, a life permitting universe/multiverse (LPM) is very, very epistemically unlikely under the non-existence of a fine-tuner (~FT): that is, P(LPM|~FT & k’) ≪ 1.
2. Given the fine-tuning evidence, LPM is not unlikely under FT (Fine-Tuner): that is, ~P(LPM|FT & k’) ≪ 1.
3. Therefore, LPM strongly supports FT over ~FT. [2]
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