The working of gravitation is complex, and it's a natural event. It's something that inevitably happened, else there wouldn't be gravity like, everywhere. But why is it complex? Because we can't figure out how it works? Is a human being complex because we can't understand how we got here? If complexity is determined by the difficulty of understanding the mechanics behind the process, why does that mean there's a designer behind all the complex stuff?

Is a rock designed because an ant doesn't understand why a rock is hard?