Romans 1:20-21

The truth about God has been made plain to even the most devout atheist. The invisible God has made himself visible through what you can see. You can think of this as the wind of a tornado. You cannot see the wind of a tornado, but when you see the cone-like shape touch the ground and cloud and debris circling around, you know to run. We can say something similar about God. You cannot see him directly – he transcends creation – yet you can see his fingerprints on his handiwork all around you.