That would be true if he created it and then withdrew from it and ceded the world to man and his fallen angels. But the Bible says otherwise (and if you don't know that that's truly appalling). The Bible says God was very active in the world even after he created it, and the believers claim he still is.
So, mom, use your reason and tell me: is the world the way it because that's how God wants it to be, or not? It's very simple: either it is his or world or it isn't. Either it is his doing or it isn't. Which is it?