According to the anthropic principle proponents, if the universal constants (e.g. gravitation, the strong force, etc.) were just a nose-hair off, the universe as we know it would not exist; stars wouldn't form and there would be no life and no us. That supposedly makes our universe truly special. To demonstrate just how ridiculous this fine-tuning argument is, consider the fact that no measurement in physics is perfect. All of them are approximations and have margins of error. That means the universal constants, that make our universe what it is, have some wiggle room. Within that wiggle room are an infinite quantity of real numbers. Each of those real numbers could represent constants that could make a universe like ours. Since there are an infinite number of potential constants within that wiggle room, there are an infinite number of potential universes, like ours, that could have existed in lieu of ours. Thus, there is really nothing special about our universe.

The claim of fine tuning is subjective. As I stated before, no measurement in physics is perfect. The amount of precision we demand can be increased or decreased at our whim. We could have an approximate measurement that has a huge margin of error and call it finely-tuned if we so desire. Theists, in particular, have a lot of such desire. They so badly want God to be an indispensable part of our universe's creation, so they see finely-tuned constants.They also tend to sweep under the rug the following fact: the vast majority of our universe is hostile to life, and they fail to consider that another hand in the proverbial deck might yield a better universe than ours, one teaming with life on every planet throughout the cosmos.