Let’s look at fine-tuning in terms of what “tuning” and “fine” mean:
The fact that the universe is tuned — that is, the fact there is any consistency at all in the laws of physics — demonstrates God’s existence. This is Aquinas’ Fifth Way, which is the proof from design. St. Thomas used the example of arrows. If we were to see arrows flying through the air, one after another, and noted that they consistently tended to land at or near a specific spot, we would correctly infer that they were shot by an archer (rather than, say, blown by the wind). Any consistency in nature implies a Mind that draws consistency out of chaos. A targeted arrow implies an archer. Note that this is not an argument from complexity. The simplest consistency in nature — a pencil falls down and not up, winter is colder than summer — demonstrates God’s existence.
The second thing that fine-tuning tells us is exemplified by fine. Fine refers to the accuracy of the laws of nature, which reveals the Archer’s purposes. By observing the precision of targeting of the shot arrows, we can discern the Archer’s motives. If the arrows are merely flying into an open field, we may infer that the archer is just testing his bow. If the arrows are consistently hitting a bulls-eye target, we may infer that the archer is practicing his accuracy. If the arrows are hitting animals in the forest, we may infer that the archer is hunting. If the arrows are hitting soldiers encircling the area, we may infer that the archer is defending from an invasion.
The tuning of nature points to God, and the fineness of His tuning points to His purpose. The anthropic fine-tuning of our universe tells us that we are God’s purpose in creation.Michael Egnor, “Multiverse myth frees atheists from real science” at Evolution News and Science Today
See also, from Michael Egnor: We don’t live in a multiverse because the concept makes no sense. Michael Egnor: Neurologist Steven Novella and philosopher Philip Goff, both atheists, agree that there are many universes besides the one we live in. Atheists use the multiverse concept to counter the fact that our universe appears fine-tuned to allow life like ours. But is it a valid concept?