"It is even conceptually impossible, since only God can create. Creation is an exclusively divine ability, and no created being can even serve as a means for creation. God is the unique source of creation, as He does not cooperate with any tools, partners, or materials in the work of creation. God's creative activity is exclusive. No one and nothing can create as God does. The creative capacity of God is an incommunicable attribute for any creature. To be able to create, that is, to bring existence from nonexistence, one must be God."
None of these claims are supported by scripture. The prepositional phrase ἐν αὐτῷ does not read "by him" but "in him." That implies agency not actor. Christ is, according to Paul, the agent of God's creation. He is not the originator of it nor the designer of it.
Additionally, Paul uses the metaphor of a son's relationship to his father. He is the image of God. The word translated image derives from the impress of a master die on a coin. Christ is not the original, but the 'spitting image' of God. He is begotten - called elsewhere the 'only begotten' son. The very word implies an origin. And we have an origin attached to him in Malachi and in 1 John. John describes Jesus as ἀπ’ ἀρχῆς, that is "from the beginning," and Malachi describes Jesus as having an origin. Five / two reads according to the AV " But thou, Bethlehem Ephratah, though thou be little among the thousands of Judah, yet out of thee shall he come forth unto me that is to be ruler in Israel; whose goings forth have been from of old, from everlasting." The Hebrew from which "goings forth" is derived implies an origin.
No matter what slant one puts on "firstborn" - whether we take it to me 'principal one" or literally 'first of all' it is still "of creation." Jesus is classed with creation. He is the agent of the creator.
In Colossians Paul is refuting a Gnostic sect prevalent in Colossae that taught that there were many intermediaries between God and man. Paul says there is only one, Jesus who is God's first work, his firstborn, who is "of creation."
You misstate Watchtower belief. You craft straw man arguments. You seek to diminish Slim's arguments by insulting his sources rather than refuting the actual point. An example is your comment on John Locke whose "Reasonableness of Christianity" is a classic. The issue here is what the Scriptures actually say, not what the vain philosophies of speculative writers have said. And restating how you wish it to be is not proof of your claims. Much of your 'argument' is based on one of the major logic flaws: that of repetition of claims without further proof.
I've had my say, I suppose. Now I leave this to you two to hash out.