But God shows his anger from heaven against all sinful, wicked people who push the truth away from themselves.
References for Romans 1:18
For the truth about God is known to them instinctively. God has put this knowledge in their hearts.
References for Romans 1:19
From the time the world was created, people have seen the earth and sky and all that God made. They can clearly see his invisible qualities -- his eternal power and divine nature. So they have no excuse whatsoever for not knowing God.