I can see how it might be possible for a man to look down upon the earth and be an atheist, but I cannot conceive how he could look up into the heavens and say there is no God.
Lift your eyes and look to the heavens:
Who created all these?
He who brings out the starry host
one by one,
and calls them each by name.
The heavens declare the glory of God;
the skies proclaim the work of His hands.