The atheist asks, “Why do you believe in God?” We answer, “Look up; look around you; just open your eyes.” The creation itself is ample proof of a creator. The Psalmist put it this way: “The heavens declare the glory of God; the firmament sheweth his handiwork. Day unto day uttereth speech, night unto night sheweth knowledge. There is no speech nor language, where their voice is not heard.” (Psalm 19:1-3) That is, day or night, here or elsewhere, the wonders of nature proclaim the God of nature.
“All things bright and beautiful,
all creatures great and small,
All things wise and wonderful,
the Lord God made them all.”
The apostle Paul wrote, “The invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse.” (Romans 1:20)