God’s revelation of Himself in creation, as in scripture, is not a problem of knowledge but a moral problem. Man does not choose to know, he holds, or better as Paul puts it, holds down the truth, suppresses it in unrighteousness. Consequently he does not know because he refuses to know. The knowledge of God however is revealed in all of creation; it is revealed in the mind, light, and body of man. It is inescapable knowledge.