“It was useful to seek to apply the method of reasoning discussed in the previous chapters to the various schools of philosophy about us. However, since we have constantly sought to bring out that all forms of antitheistic thinking can be reduced to one, and since the issue is fundamentally that of the acceptance or the rejection of the concept of God, it may suffice to apply the analogical method of reasoning in an argument with those who hold to the “scientific method” of the day. That scientific method is agnostic. It claims to be willing to accept any fact that may appear, but unwilling to start with the idea of God.
Reasoning analogically with this type of thought, we seek to point out that it is psychologically, epistemologically and morally self-contradictory. It is psychologically self-contradictory because it claims to be making no judgment of any sort at the outset of its investigation, while as a matter of fact a universal negative judgment is involved in this effort to make no judgment. It is epistemologically self-contradictory because it starts by rejecting theism on the ground that its conception of the relation of God to the universe involves the contradiction that a God all-glorious can have glory added unto him. By this rejection of God, agnosticism has embraced complete relativism. Yet this relativism must furnish a basis for the rejection of the absolute. Accordingly, the standard of self-contradiction taken for granted by antitheistic thought presupposes the absolute for its operation. Antitheism presupposes theism. One must stand upon the solid ground of theism to be an effective antitheist.
Finally, agnosticism is morally self-contradictory since it pretends to be very humble in its insistence that it makes no sweeping conclusions, while as a matter of fact it has made a universal negative conclusion in total reliance upon itself. The “natural man” is at enmity against God.” Van Til, A Survey of Christian Epistemology, Table of Contents Chapter 16 A Sample of Christian Argument