What qualifies the 3 entities of the Trinity as one?
Now that the concept of the Trinity is more comprehensible to me - that the Trinity is not one entity with three different aspects, but rather three entities with different personalities with a shared essence and relationship with each other (perichoresis)
There's a very minor yet SIGNIFICANT semantic nuance. My friends and I are human (human as in adjective, denoting our attributes), but we are not ONE human (human as in noun, an entity that possesses the quality of being human). My friends and I share the attribute of being human, but we are not one human.
If I for instance take three laptops of the same model, I could say that they are the same laptop, in the sense that they are the same model - created by the same manufacturer, share the same components and OS. However, we are still talking about three laptops, not one.
As such, Christians call the Son, the Father, the Holy Ghost God (God as in adjective, denoting the attributes of divinity to each respectively), but the Son, the Father, and the Holy Ghost wouldn't be ONE God, would they? (Of course I understand Christians cannot proclaim to believe in three Gods, but is this logically consistent?)
Another analogy: Say I abolished the power hierarchy between all the Greek deities and gave them the same essence, but kept their specified roles and relationship with each other. I claim that they are one, but for all practical purposes they really are not "one". That's how I understand the Trinity
Then by which standard do we classify them as one? What is it that makes them out to be one? in which sense are they one? Is it the close-knit relationship they exhibit with each other?
If I may interject my personal opinion, I believe Christians are trying too hard to market this as monotheism. This may not be tritheism per se, but this is not monotheism either, the Trinity deserves its own theological category.
EDIT: The attached question is not the same as mine. The attached question merely seeks an explanation of the general concept of the Trinity, while I request people to directly address the question as to why/how the triune personalities of the Trinity constitute one God.