Natural theology assumes a deistic view. It postulates a God who, after creation, withdrew from the world and concealed himself behind that which He had made. And it looks upon men as left to themselves and desiring nothing more than to find God by means of the evidence of Him which creation bears; for they would worship and serve Him.

But Paul believes that God is living and ceaselessly active. Ever since creation He has been active in the life of man. In His work He reveals His eternal power and glory. As to mankind, Paul holds that, though God ever comes to meet with him, man does not honor him as God or give thanks to Him.
 

Anders Nygren. Commentary on Romans. New edition. Augsburg Fortress Pub, 1978. On Romans 1:18-32.