After Paul finished his introduction in Romans, he immediately began exploring how all people have knowledge of God the Father. Starting in Romans 1:18, Paul said that God is revealing Himself to all people, “since what may be known about God is plain to them, because God has made it plain to them.” He continued, “For since the creation of the world God’s invisible qualities-His eternal power and divine nature-have clearly been seen, being understood from what has been made, so that men are without excuse.”
In other words, God reveals Himself continually and clearly to all people. Paul assumed their knowledge of God when he said, “Although they knew God…” Every person on the face of the earth and every person through history-without exception-has knowledge of God the Father. The man in the African jungle, the woman in the Asian villiage, the nomad in the remote dessert, and the Inuit in the forgotten tundra, regardless of where or how they live, have this in common. All people have knowledge of God because God has revealed Himself to them.
Of course, not all people in the world say they believe in God. That leads to the second affirmation.