Wonderment
You can poke fun, but maybe you could know the Bible enough to know that it is not a book of theology, it is not a book of dogmatics, it will not declare it like the Chalcedonian Creed. But he teaches in terms of content: that He was God, and that He also became man. These are two different natures, and by definition, different attributes are associated with them.
It's like having two baskets and a bunch of apples. Red apples go into one basket, green apples into the other. In the Holy Scriptures, statements ("apples") suggesting Jesus' deity go into one "basket" (referring to his divinity), those referring to his humanity go into the other. Christian theology is precisely about the fact that no "apple" has to be thrown out or distorted, as the NWT does, but only put in the right "basket".
So is it sufficient for you, to prove the existence of those two "baskets", or should I prove it in every single statements that which one does it belong to? Or is say: it's purely logical (for example, Jesus suffered, as God cannot suffer, as human he can, so it's meant according to his humanity), you will cry: "It's philosophy!"
Don't forget that, according to Nicene theology, the Son received both his existence and his divinity from the Father, but not in time and not in a derivative, separable manner. Just a reminder: "The Father is made of none; neither created, nor begotten. The Son is of the Father alone; not made, nor created; but begotten." (Athanasian Creed)
Between theotes and theiotes, that certain letter i means the same thing as in the case of homoousious and homoiousous. The first means deity (godhead), the second means divinity, divine nature, godlike character. So without the "i" it means possessing the very same quality of God, thus being truly and fully God, with it a lesser, similar ("kind of") divine quality. The apostle uses the first.
Let's see the WTS' arguments you were refering to (Reasoning From the Scriptures)
"Colossians 1:19 (KJ, Dy) says that all fullness dwelt in Christ because it “pleased the Father” for this to be the case. NE says it was “by God’s own choice.”".
But the Greek text has no trace of it being the will of the Father, on the contrary, the Fullness wanted it that way: "hoti en autō eudokēsen pan to plērōma katoikēsai". This fullness is, according to the immediate precedent, the fullness of deity, not some vague, diffusive, and indistinct divine "nature" fullness. Your denomination is trying to restrict this to some undefined attributes, which the apostle does not do.
However, it is clear: you are trying desperately to plug in here this mistranslating divine "nature" so that you can then abruptly turn to the Peter letter, which you are desperately trying to flatten out the divine fullness dwelling in Jesus, stammering that according to Peter, believers also became partakers of the divine nature, and so the divine nature of Jesus is no more than this. These Watchtower struggles are transparent, and they can be nailed firmly to the ground here, where they may continue to wriggle to the great amusement of those who know the Bible.
"In him, and not in the creators or teachers of human philosophies, does this precious "fullness" dwell."
This is awkward, evasive sidetracking: a childish stirring of emotions with buzzwords against the doctrine of the Trinity, which also appeared in philosophical garb from the 4th century. But it took its essential content from the Bible, not from any philosophy.
"Is the Apostle Paul perhaps saying here that the "fullness" in Christ makes Christ himself God? According to Colossians 3:1, no, because here we read of Christ that he "sits at the right hand of God."
This is not a refutation, because here the word God refers to the Father (elsewhere it refers to Jesus). The believers in the Trinity never claimed that Jesus is identical with the Father, and thus sits at his own right hand.
"Being truly “divinity,” or of “divine nature,” does not make Jesus as the Son of God coequal and coeternal with the Father"
But the fullness of deity does.
"Just as "humanity" or "human nature" does not mean that every human is equal or coeternal any more than the fact that all humans share “humanity” or “human nature” makes them coequal or all the same age."
Except that it does mean that in their humanity, all humans are equal, and so in parallel: in their deity, the Father and the Son are equal (Phil 2:6).
The fact that you simply label the concept that time itself is a created reality as "philosophy" (although the New Testament uses many terms used in Greek philosophy), which in WTS terminology has a pejorative meaning (I would rather call it common sense, logical conclusion), doesn't refute it.
I note that what the Watchtower labels with the term "philosophy" is usually nothing more than the use of common sense, logic, and conclusions. Of course, they want to discourage their rank-and-file members from this, so that they don't end up using the particular organ that is in their skull, because "OMG! That's philosophy!" Cf. Thought-terminating cliché