welcome Bro Final Overture,to the thread ...
First : I agree with you that The idea that through Jesus everything is created comes from "By the word of the Lord the heavens were made" ,the writer of John believed that Jesus is that word.
Second: Again I agree that "Jesus never said that through him everything was created" , it is the writer of John ,also the writer (s) of 1 Corinthians 8:6 , Colossians 1:15 , Hebrews 1:1 ,who said so .
1 Corinthians 8:6
Yet for us there is but one God, the Father, from whom all things came and for whom we live; and there is but one Lord, Jesus Christ, through whom all things came and through whom we live.
Colossians 1:15 He is the image of the invisible God, the firstborn over all creation.For by him all things were created: things in heaven and on earth, visible and invisible, whether thrones or powers or rulers or authorities; all things were created by him and for him.He is before all things, and in him all things hold together.
Hebrews 1 1 In the past God spoke to our ancestors through the prophets at many times and in various ways, 2 but in these last days he has spoken to us by his Son, whom he appointed heir of all things, and through whom also he made the universe.
Though Trinitarians understand the verses as Jesus God the pr-existent creator, Unitarians understand the verses as the function of God the Father as the SOURCE of creation is distinguished from Christ's role as MEDIATOR of creation
the Father alone is the source and his first creation (the only direct creation by Him), His only-begotten son, is the channel through whom he caused all the rest of creation to be.
Such controversy shouldn't bother us even for a minute, as both of their understandings are against Islam ... Jesus neither God the creator nor the channel through whom he caused all the rest of creation to be.
The Islamic Jesus is a by product of the word ,not the word ,and wasn't the entity through whom the universe was created....
Third : The goal of the study is not to prove a Trinitarian reading against a Unitarian one ,neither the opposite ... but rather to say that BOTH readings are against Islam , and there are no valuable consequences ,to held any of the readings for the truth of Islam .....
I explained before why the question of whether the Bible contains a textual support for the trinity,is of no merit . and should make no difference for Islam or Muslims.
Fourth : I believe that the writer of John(and others as well,eg;Paul) believed ,at least ,of the pre-existence of Jesus as a conscious entity (whatever grade such entity is considered, whether God or divine but not God)... If you read their texts without any preconceived ideas, expectations ,you most probably agree with me.
Fifth: The matter is different when it comes to the synoptic gospels .
I think nothing compelling to suggest from any passage from the synoptic gospels, that the writers,in spite of their highly,mostly non Islamic elevated views of Jesus, believed in him as God ...
I hope the next posts I elaborate more those points.