As well, if this position is true, whose fault is it if the “unregenerate” man never accesses the “things of God”?
Answer: God, you make God morally culpable.
What scripture is actually teaching, outside of the contamination of the Calvinism, not the contrast between the natural man and the regenerate man but rather that from the natural perspective and the spiritual perspective.
People were putting natural wisdom of Greek philosophy over what needs to be understood from a spiritual perspective.
Go read 1 Cor 2 and step outside of bias you bring to the text and read from the perspective of Paul and his audience.
“These are written that you may believe that Jesus is the Messiah, the Son of God, and that by believing you may have life in his name.” (John 20:31)
The power of conversion is in the hear and reading of the written word.
The word of God is sufficiently powerful, faith comes by hearing. Scripture is clear.