To my opinion, the perfect proof can sound something like that:
Thesis: "If a human would know absolutely everything, then he can not be an atheist."
Proof: Indeed, such one is Omniscient one, thus, he would be God. But God is not atheist. "you are Gods", says Bible at least in two verses: in Old Testament and in New Testament.
The general history of the universe and Earth have been determined by studying that which now exists and reverse-engineering it.
It should be noted that we were not present for most of the events -and can not readily reproduce them (except by modelling using available data).
The same principles can be applied to determine whether or not self-aware creativity was necessary overall or at any time, but there has not been much serious interest in doing so.
Apart from the many issues relating to the human situation which cloud the basic question, there is the problem of reference.
In order to determine that something was created by man, for example, "nature" is referenced. Man is able to produce things which are not produced by "nature".
The actual thing in question can also be referenced. If man produces something different from what "nature" produces, that thing is often indicative of the nature of its creator (What use would a tree have for a computer, for example [extreme purposeful complexity].)
In order to determine whether the present dynamic natural systems (the universe and all its components and processes -which once did not exist as such) required self-aware creativity, it would be necessary to reference pre-"nature" nature.
This may sound impossible, but the evidence is all around us. That which now exists is that which existed previously -but in a different configuration.
Furthermore, the same BASIC principles will always have applied. Pre-"nature" nature could only produce certain things before self-aware creativity was applied.
It is logical that any thing which is complex is made of more simple components -but also necessarily THE MOST simple components.
It may not seem so -as on our level one thing might be made of wood and not metal, for example, but both of those are made of the same basic components -and those components are made of the same basic components. Everything we are and may experience is logically the same most basic components in different configurations.
Therefore, our reference would be the most simple states which could produce the present states. It is logical to begin with the most simple components which can be modeled. We may not have identified them directly, but we do have the basic languages of reality with which to work -math, logic, etc.