According to Buzzard, this faith is "so afraid" of the [illogical, unreasonable, scary, ...] Trinity, that it is therefore impossible for them to get their heads around the possibility of God having a son. Without the Trinity dogma, this world religion would presumably accept God having a son, no problem at all.
That strikes me as a very big assumption indeed. I wonder if he ever bothered to ask any of his friends who believe that faith? I wonder if he is able to explain why that faith does not simply revert to pure Jewish monotheism?