The concept of "God" throughout history has always been used to fill gaps in our knowledge. A few thousand years ago, "God" (not necessarily your God, but one of many thousands of Gods invented by humanity throughout time) was credited with the motion of the sun and the stars in our daily cycle.
Fast forward a few thousand years, and early astronomers credited the motion of sun/stars to physics, but struggled to account for all the variables that kept us in perfect orbit. Thus "God" again was used to fill the knowledge gap, using his divine powers to keep our solar system in balance.
Fast forward a few hundred years, and modern astronomers used advances in mathematics and physics to perfectly describe the motion of all bodies in our solar system using physics. The knowledge gap had been eliminated, and thus God was also eliminated from the equation.
You can repeat this observation in any area of science throughout history. How does a bird fly? Why do the monsoons come once a year? How did species evolve? Etc.
Creationists may not realize it, but you're also athiests. You don't believe in Zeus, or Vishnu, or the Great Eagle Spirit, or in any thousands of Gods from hundreds of major religions that have existed throughout human history. Many of those long forgotten religions were around longer than your religion. And in another 500 years, your religion will likely be replaced as well. People in the future will look at your God with the same sense of wonder that we look at ancient Egypt's Anubis.
Carlin on UFOs vs. God