Does Adam have "natural theology"?

Adam therefore possessed these principles uncorrupted, just as they belong to nature. At that time he was able by comparing these principles with his reality and with signs to assemble in order the works of reasoning, to take them apart, to draw conclusions, and to decide, also according to nature, whatever nature could accomplish in divine matters by its ability. Finally, he was able to acquire some knowledge of divine matters according to the limit of his intact nature. (Franciscus Junius, A Treatise on True Theology with the Life of Franciscus Junius, 152)

What is "natural theology"? Franciscus Junius, a theologian in the 16th century, claimed a certain form of natural theology which is not autonomous but that comes from God through nature. In that sense, it is definitely better than the normal version of "natural theology." But where exactly is the proof that there is such a thing as "natural theology"?

"Natural theology," in order to be natural theology and not general revelation, must utilize reason. General revelation is what God reveals to Man, whereas natural theology must be inferred by man from nature in some manner. In other words, what differentiates general revelation from "natural theology" (in Junius' sense of the term) is whether God's revelation in nature is mediated by reason ("natural theology") or not. Therefore, Romans 1:19-20 cannot be used as a proof-text for natural theology, or Psalms 19 either, because all that is taught in those passages is General Revelation.

It is in this sense that I am not convinced of any case for any form of "natural theology." The idea that Adam prior to his fall had true natural theology is far fetched only because we know that God talked with Adam in the Garden of Eden. Adam did not "acquire" some knowledge of divine matters, as God directly interacted with him! Adam did not wake up in the Garden, looked at the world around him and deduced with his (at that time) sinless reason that God exists. No! Adam woke up to God his Creator already with him, and thus he knew God personally, not through inference.

It is for such reasons that "natural theology" is defective, no matter how well it is dressed up. We should reject the entire notion that reason, even one aided by God, can arrive at God even imperfectly. Without special revelation, reason cannot reach God, and this is what we should believe.