Surely you do not think all the arguments generated from biblicalunitarian.com are convincing to the point where they are deemed objective facts. Many arguments generated by Unitarians against scripture that Trinitarians use are pointed to as possible interpretations. Trinitarians would go to the Greek and Hebrew scriptures just as much as Unitarians do.
If someone has no ulterior motive and wants to know the truth, but is not convinced to choose one side after searching, I don't think God will punish them for their limited understanding concerning fully understanding His nature.
Christ said the Holy Spirit will convict the world of their sin, not of Unitarian versus Trinitarian doctrine.
Also, you know Trinitarians would say that the Father sent the Son and the Father is greater than the Son. They will not deny this, but they interpretate it in a way that Christ has two natures and in his human nature, the Father is greater. If you are going to attack a point of Trinitarians, attack the whole point.