Satan has always counterfeited God's creation even Humans. Here are just a few examples of what God has made & Satan has counterfeited. God - An unmovable earth Satan- A movable earth. God - All plants & trees. Satan - Plastic Artificial types. God - Silk, Cotton Satan - Satin, Nylon...
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Every example you give is unscriptural, in that scripture does not say any of the things you claim, but actually contradicts them. Specifically your argument is contradicted by John 1:1-18, which states that it was by our Lord, God and Savior Jesus Christ that all things were made.*
It also attributes evil to things which are clearly not evil and in the case of Fool’s Gold, or Iron Pyrite, is a naturally occurring mineral that while not gold, is quite beautiful, forming elegant shapes. Testing gold in the fire, while it would expose iron pyrite, would be unnecessary in that case because fool’s gold is obviously not gold, lacking the malleability of genuine gold at normal temperatures. But it would be a way of separating gold alloys from pure gold, and of purifying gold and removing other minerals found within it, and of separating a layer of gold from a coin made of some other metal.
And the elements composing “fool’s gold” are also created by God and are natural and beautiful. For example, iron, which we depend on for our very life, since it is a vital ingredient in our red blood cells which carry oxygen to the different parts of our body.
Other objects you list also impute evil to things which are neutral or good. For example, artificial trees are not inherently evil, but represent a beautiful form of art, which allow us to study the shape of God’s trees, as natural objects, and which are used to decorate and beautify model railroads, and architectural models, and other things. Indeed there is an entire art of producing miniature objects - one of my favorite miniature projects is the miniature of the uS White House (I used to have a book about it, which was a fantastic guide both to the beautiful interior of the White House and the art of the miniaturist - it had functioning miniature televisions for example. It was the ultimate doll house. And when it was vandalized while being exhibited in the Netherlands, the Dutch government was so upset, they directed the Corps of Miniaturists of the Dutch Royal Navy, who built miniature ships as a living for use in naval planning and naval architectural studies to assist in its restoration.
The idea of the devil creating evil counterparts to the good creation of God is foreign to Christianity, but rather originates in dualist religions such as Zoroastrianism (which is almost like a mix of Judaism and Hinduism, in that it has the hierarchy of angels of Judaism but in other concepts it is closer to Hinduism, or rather, is like anti-Hinduism). It is also a component of the Zoroastrian-derived mystery cult of Mithraism practiced by men in ancient Greece and Rome. And it is a component of the Manichean religion, which is a heretical cult that combined elements of Christianity, Zoroastrianism, and emanationist-Docetic sects such as the Valentinians. But it is closest to Zoroastrianism insofar as it divides the world between good objects created by God and bad objects created by the devil.
*For this reason, the attempt to make the Trinity gender-neutral by referring to the persons of the Father, Son and Holy Ghost as the Creator, Redeemer and Sustainer clashes with Scripture for the second time, after first being contradicted by Matthew 28:19.