The focus of the article is really on the history behind the development of the trinity doctrine, not on biblical proofs that prove or disprove its validity.
At a glance, I see the name Gibbon multiple times as well as the names of other references I do not immediately recognize.
Gibbon was an historian, not a biblical scholar. As far I as I know, Gibbon was not skilled in the languages required of biblical scholarship and whatever references he provides are unlikely to be Aramaic, Greek, or Hebrew texts. I therefore presume similar of the other references that I am not familiar with.
For some reason, you choose to place your trust in the opinion of whoever wrote the article you post for your threads who in turn chose to place his trust in the opinion of men unskilled in biblical scholarship.
Are you sure that you have proven all things?
The idea that the Trinity is not Scripturally supported is false.
There are quite a few Biblical concepts which aren't described by a specific word. You won't find the word "Bible" there....does this mean there is no Bible? No. "Omniscient", "omnipotent", and "omnipresent" are all words used to describe attributes of God. Because they are not specifically found in Scripture, does this invalidate their truth? Of course not.
There are other words not mentioned in Scripture such as "atheist", "divinity", "incarnation", and "monotheism." Does this mean they're invalid concepts? No.
The Trinity-----or simply, God the Father, God the Son, God the Holy Spirit----is a true concept that is no LESS true just because we don't see the word used to describe it.
Matt. 28:19, "Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit "
2 Cor. 13:14 "The grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit, be with you all. "
Eph. 4:4-7 "There is one body and one Spirit, just as also you were called in one hope of your calling; one Lord, one faith, one baptism, one God and Father of all who is over all and through all and in all. But to each one of us grace was given according to the measure of Christ’s gift."
Jude 20-21 "But you, beloved, building yourselves up on your most holy faith; praying in the Holy Spirit; keep yourselves in the love of God, waiting anxiously for the mercy of our Lord Jesus Christ to eternal life."