Its goal may be a kind of orthodoxy, but its methodology is simply a radical heresy. God created the heavens and the earth, and all things therein, including man and man's reason. The clay cannot judge the potter nor sit as a court to verify the potter's existence. Such a procedure is an absurd arrogance. Cornelius Van Til repeatedly demonstrated the circularity of man's reason.
Man begins on certain given premises to reason to their necessary conclusions.
His thinking has a context. He does not approach any subject except from the given context of a given world. Still worse, the philosophers, most obviously the rationalists, refuse to deal with the fact of man's Fall and the effect of the Fall on man's mind. Bk I, chapt. Salvation should not confirm man in the priority of his reason but rather make him mindful of its limitations and the sufficiency of God's revelation.