The distinction is that unlike everything in creation, God does not derive His being from an outside source. You and I, and (everything else) are dependent on t

The distinction is that unlike everything in creation, God does not derive His being from an outside source. You and I, and (everything else) are dependent on things outside of us to cause us to be and continue being. We are, out of, something else. Not one of us decided to be born, but through the actions of others we came to be. And we continue to be, because we have food and water and shelter and clothing, etc. God, unlike the things He has made doesn't depend on something else to be or continue being. He has always been. He isn't out of anything but is self-existent; He doesn't exist but rather is. And because He is, everything else (all of which depends on Him to be) continues to be. I hope I've worded that clearly.