I hold that belief in God is not merely as reasonable as other belief, or even a little or infinitely more probably true than other belief; I hold rather that unless you believe in God you can logically believe in nothing else. But since I believe in such a God, a God who has conditioned you as well as me, I know that you can to your own satisfaction, by the help of the biologists, the psychologists, the logicians, and the Bible critics reduce everything I have said … to the circular meanderings of a hopeless authoritarian. Well, my meanderings have, to be sure, been circular; they have made everything turn on God. So now I shall leave you with Him, and with His mercy.
Van Til, Why I Believe In God. Quoted in Bahnsen, Van Til’s Apologetic (1998), p143.
Everyone has an ultimate authority. To be consistent, reasoning will necessarily circle around that authority. The only difference between us is the particular authority we have chosen to circle around.
So, is circular reasoning the only thing Presuppositionalism has to offer? No. Van Til in the above quotation points to a transcendental argument, not a circular argument, as the best apologetic for the Christian God.