I know natural theology, or the idea that God can be known through simple discovery and reflection on nature is quite popular among contemporary Christians as well as in the tradition. But as I read the Bible this seemingly intuitive belief is not confirmed; instead, there is an emphasis upon special theology, or the Self-revelation of God as the only source for genuinely knowing the true and Triune God. For example, and this can be multiplied over and again from the Pauline corpus, the Apostle Paul writes in Galatians 1:
11 For I would have you know, brethren, that the gospel which was preached by me is not according to man. 12 For I neither received it from man, nor was I taught it, but I received it through a revelation of Jesus Christ.
Paul, in context, is arguing for his Apostleship against pseudo-Apostles, but as part of his argument he expresses an idea that is premised in a non-natural theology approach towards God; he implicitly is arguing for revelational theology. T.F. Torrance elucidates what revelational theology entails further:
By its very nature divine revelation is what Karl Barth called ‘a self-contained novum‘, for it has its reality and truth wholly and in every respect within itself, and so can be known only through itself and out of itself, on its own ground and through the power of its own self-evidence and self-authentication. It is as such that revelation proceeds from God to man, breaking sovereignly into human life and thought, calling into question what people claim to know, and directing their thinking beyond themselves altogether. It creatively evokes an entirely new mode of consciousness, in faith and understanding, conditioned by a new relation to God initiated and set up, not from man’s side at all, but from the other side of the boundary between man and God. The knowledge of God given in this way through divine revelation is not from the known to the unknown, but from the hitherto unknown to the known. It is a mystery so utterly strange and so radically different that it cannot be apprehended and substantiated except out of itself, and even then it infinitely exceeds what we are ever able to conceive or spell out. Far less may it be assimilated into man’s familiar world of meaning and be brought into line with the framework of its commonly accepted truths, for the radically new conception of God proclaimed in the Gospel calls for a complete transformation of man’s outlook in terms of a new divine order which cannot be derived from or inferred from anything conceived by man before. In point of fact it actually conflicts sharply with generally accepted beliefs and established ideas in human culture and initiates a seismic reconstruction not only of religious and intellectual belief but of the very foundations of human life and knowledge.
All of this is important for a variety of reasons, but the primary reason, I contend, is that it keeps us from imposing our ideas on who God is, and allows him to impose who he is on us instead.
I don’t expect advocates for natural theology and the so called analogia entis to repent anytime soon, but I think they really should. No matter how prestigious of a pedigree that natural theology has in the Christian tradition, that prestige cannot be the final word; God’s Word in Jesus Christ must be allowed to be that. We don’t need natural theology to know God, we need Jesus Christ alone as God’s Self-exegasato (exegesis).
 T. F. Torrance, The Christian Doctrine of God: One Being Three Persons, 19.