Check out this video from William Craig’s ministry, Reasonable Faith, explaining why God exists using the fine tuning of physical constants.
Here is the three step argument:
The universe evidences order and design
A design implies a designer
A designer of the universe exists
This argument works for any living creatures (hummingbirds, bacteria, etc.), complex organs (eyes, hearts, brains), language of DNA, as well as the physical constants governing the forces of nature.
