There's never been a doubt when you walk into an art museum, that those beautiful works of art didn't have a creator. When you walk into a building with unbelievable architecture, that those walls didn't have an origin. Why would seeing the mountains on the horizon be any different? Or the stars in the sky?
"For since the creation of the world God's invisible qualities--his eternal power and divine nature--have been clearly seen, being understood from what has been made, so that people are without excuse." - Romans 1:20