God can be known

Having considered the arguments in favor of the doctrine that God is, and also the various systems opposed to Theism, we come now to consider the question, Can God be known? and if so, How? that is, How does the mind proceed in forming its idea of God, and, How do we know that God really is what we believe Him to be?

It is the clear doctrine of the Scriptures that God can be known. Our Lord teaches that eternal life consists in the knowledge of God and of Jesus Christ, whom He hath sent. The Psalmist says, "In Judah is God known" (Ps. lxxvi. 1). Isaiah predicts, that "the earth shall be full of the knowledge of the Lord" (Is. xi. 9). Paul says even of the heathen, that they knew God, but did not like to retain that knowledge (Rom. i. 19, 20, 21, 28).

Hodge v 1, p 335