How do you know that empty space exists? You can't grab hold of it. You can't find ways to analyze it directly. Science doesn't really know what it is. So, can you prove that empty space exists? Or is empty space just a belief?

The way we know that empty space exists is to analyze relationships between some of the things that lie within empty space. So, we know that empty space is a fact. We don't have to simply believe.

Cause and effect, entropy, and complexity, when combined as they are in our universe, prove that God exists. Why? Because these 3 things can't exist together as they do in our universe without God making them to exist this way.

Do these 3 describe God? Barely. We can't tell from these 3 if He is the God af any particular religion, or if there is no religion that describes Him. But they DO let us know that He exists, simply because they could not exist without Him.