Fundamentally, I believe the reason White engages this debate is because he is trying (and failing) to establish a sola scriptura position on the doctrine of the Blessed Trinity. In the end, the objective reader is forced to conclude that this doctrine was not "divinely stipulated" by Scripture alone. The Dogma of the Blessed Trinity, while scripturally sound, was not explicitly defined until late in the 4th century.
Here is a discussion I have been having on Beggars All on this topic too:
This is why Ustadh Adnan Rashid "wins" this debate. Adnan has not assailed the TRUTH of the Blessed Trinity in the least - but he has demonstrated another weakness in the sola scriptura debate. Keep this fact in mind as you watch the debate. One of the things I was disappointed in was that Adnan himself deviated from the theme/thesis of the debate in introducing arguments about the Early Church Fathers. Whether or not they supported the doctrine of the Blessed Trinity is immaterial to this debate - and thus a distraction - which just gives James more room for distraction from the main point.
I believe James and his followers, like Ken above, truly believe James was able to "stipulate" the doctrine of the Trinity from Scripture - but I also believe the objective listener/watcher of that debate will agree with me - that James fails to do so because the premise of this debate is stacked against him. Watch and listen, see if you agree with me.