Forget about proving God, Is it man-made?

I have been thinking a lot about proving God and proving intentionality with life, and have come to realise that even proving something is manmade is quite hard. Even Aristotle was only a little help. Is there some way we can prove that something is man made? Some method?

In ancient times, BC, an Egyptian peasant boy and his father are going to the shore to inspect a net when they see washed up all over the beach and bobbing in the waves before them, plastic rubix cubes, most jumbled, some not.
They have never seen plastic before, let alone a rubix cube. They take a handful home to determine if they are manmade or not. The boy thinks they are. Dad is not convinced. For the sake of argument we will say the colors are painted on, not on paper stickers.

Material Cause: That out of which a thing comes to be and which persists (What its made out of)

Boy:
The plastic material is different to those materials in my known environment, suggesting it was manufactured.
Father:
I know of fine timbers, perfumes and precious metals we import into Egypt, and they are not laying around here either- doesn't mean they're manufactured.

Formal Cause: The pattern structure or form that the matter realises in becoming a determinate thing. (The blue print, template)
Boy:
The object has symmetry. I know that manmade things have symmetry - houses, swords, chariots and clothes have symmetry.
Father:
Humans and animals have symmetry. There is a symmetry to day and night.
Boy:
It turns (twists), and natural things don’t turn. Wheels turn and doors swing open.
Father:
Papyrus reeds can be twisted, or water rung out from moss. That doesn’t imply a purpose.
Boy:
But even after twisting, the object remains as if in original condition.
Father:
Twisting Clay in one’s hands does not change the nature of the clay.
Boy:
Things can be manufactured in his world and they are identical, just like these cubes.
Father:
Even with the highest standard of manufacturing no two coins, swords or chariots are exactly alike.
Boy:
The item is unique and constrained suggesting craftsmanship.
Father:
A fish is unique in its way, and constrained.
Boy:
The identical nature between cubes in both form and function goes against what I know of nature and quantum mechanics.
Father:
Two bream can look identical. The function is not known, only the degree of freedom the object has.

Efficient Cause: Topic of Enquiry The agent or entity responsible for the matter taking its specific pattern, structure or form (How was it manufactured)

Final Cause: That for the sake of which a thing is done. (Purpose)

Boy:
There is a color matching game encoded in the cube.
Father:
That is not a game. It’s a pattern.
Boy:
The patterns on Pharoh’s wall are painted by man.
Father:
The patterns in the sky are painted by the Gods.
Boy:
But there is sense in the pattern that I can understand and manipulate.
Father:
There is sense in the pattern of the seasons that you can understand and manipulate for fine crops.
Boy:
I can easily find a use for the object, easily convert it into a game, especially if there are more than one cube. You could race other people for example.
Father:
Like you do when you float sticks down the river?
Boy:
It looks made for people and therefore must be made by people.
Father:
Like the conch shell we blow when an enemy is approaching?
Boy:
I cannot classify it against anything I have ever seen.
Father:
Wait until I take you to a volcano next month.
Boy:
It says, Made in Egypt right here.
Father:
Go to bed.