TAG Defeated in One Fell Swoop

Proponents of TAG paint themselves into an unavoidable corner. They say that their god is an “absolute God” which can only be proved by means of a “transcendental argument.” For example, Cornelius Van Til proclaimed:

Now the only argument for an absolute God that holds water is a transcendental argument.

Also, as a central tenet of their apologetic scheme, presuppositionalists claim that one cannot “make sense” of anything apart from “presupposing” the existence of the Christian god. Or as Greg Bahnsen baldly asserted in his debate with Dr. Gordon Stein: “without Him it is impossible to prove anything.”

The acronym “TAG” refers to what apologists call the “transcendental argument for God’s existence.” So it is intended to denote a specific argument. Broadly speaking, an argument is the attempt to infer a conclusion from a set of premises. But there’s a significant problem here, and it’s insurmountable:

Klouda-ing the Issue

Posting under the name Bryan Klouda, a visitor to my blog A Proof that the Christian God Does Not Exist recently left the following comment:

Haven't read the comments or the entire post, but got to the square circles part.  

Out side of the context in which the argument is being made, square circles do exist. A shape with 250 sides can be considered a circle, just like a shape with 4 sides can be said to be a circle. Since a circle is defined as something like every point on the circle is equidistant from its center, it can be said that no circle even exists because you can never have a perfect circle, and if the shape doesn't fit the criteria of the definition, it follows that it must be something else.