Sometimes the answer may be more obvious than you realize. Existence as such is a miracle that declares the might of someone (Creator) or something incredible powerful.
The order in the universe tells also something. It is the specific kind of order that allows the existence of life and humans. It may be understood as something that is part of the mechanisms that gave birth to existence, or it can be seen as something that declares the might of the Creator over all chaotic forces.
In the ancient cultures, people were more prone to explain everything as acts of gods. For them, the quality of the universe around us could tell something about the might and glory of the Creator.