I’ve written a lot about why the being proved by the Five Ways is “what all call God”, but there doesn’t seem to be much need to write about why the being proved by fine tuning argument is what all call God. For example, Sean Carroll, though critical of the fine tuning argument, concedes if a fine tuner existed (a) it would be God and (b) we could know him as God by scientific knowledge. A fine tuning being is thus implicitly, presumptively, and even somehow unconsciously the sort of being that science calls God, and in excavating our ideas of the fine tuner we come into contact with our ideas of divinity.
But God is not essentially a fine tuner, i.e. fine tuning is not a properly divine attribute, nor is it an analogical development of the notion of attunement. Analogous names in theology, at least as Thomas explained them, are terms we first understand to belong to one thing, but which we come to learn are more fully realized in something else, e.g. kids call candy the best good in life but eventually learn that goodness is more fully realized in something categorically different from candy. The Five Ways all involve this sort of analogous learning about terms like mover, act, agent, necessary, true, good, dignified, director, etc, but the fine tuning argument makes no similar claim about the tuner. It seems like God tunes the universe the same way the guitarist tunes his the strings, by providing some precision that they cannot provide for themselves.
Or is there some analogue after all? Presumably, the argument is that a fine tuning God provides something to nature in a way that transcends physical causality, so what we first understand by “tuning” (an interactive process of fingers pushing and pulling on tuning pegs) is analogous to a non-interactive cause imparting a precision to the universe.
Then again, it’s hard to see Sean Carroll conceding even the possibility of an analogous, non-interactive causality, whether of fine tuning or anything else. Suppose I raised the possibility with him. The best-case-scenario dialogue would be pretty short:
Carroll: Sure, non-interactive causality is as good a hypothesis as any. What’s your evidence?
Me: Well, look at these examples of fine tuning in the universe. They’re evidence of a sort of causality outside of any known law.
C: Okay, I’ll grant that they count as examples outside of any known theory, but all sorts of things are like this. In 1800 the perihelion of Mercury counted as evidence of a causality outside of any known law; before Bohr, spectral lines counted as evidence for the same thing. How are you concluding that your examples are not just outside of a known theory, but are instances of non-interactive causality?
M: I guess I don’t have any evidence of that at all.
C: Well, come back when you have some.
Thomas’s answer to this question is entirely different. Physicists seek explanations for things, and no infinite regress is explanatory, e.g. one can’t explain the stability of the earth by resting it on a turtle. But explaining motion through moved movers generates just this sort of infinite regress, and interactive movers are moved movers.
Assuming with Carroll that interactive movers are natural, Thomas’s argument concludes that limiting the domain of ultimate explanation of the physical to the interactive is correct so far as we consider the explanation qua physical and not qua explanation. To sharpen this, qua physical the ultimate explanation of physical phenomena must be interactive, qua explanation it cannot be. As physicist, Carroll rejects a priori the possibility of non-interactive causality, but things change dramatically when one sees himself as a seeker of explanations.