(quote from RealReality.org/Real_Faith_and_Reason_Vol_2_-_Scientia.pdf)

God also reveals reality through observations of His creation. He tells us this in the first chapter of Romans. He reveals not only material reality but also spiritual reality through the things He created. Not even failure to acknowledge God can stop this revelation. So God won’t excuse anyone who refuses to acknowledge Him. While God still reveals reality if we fail to acknowledge Him, failure to acknowledge God keeps the rebellious mind from being rational. If you fail to acknowledge God, you can’t tell the difference between truth and error. You can’t tell good from evil or reality from make-believe. And at a certain point, God allows those who persist in rebelling to walk into total darkness.

(end quote)