All the worst features of a cult, with the possible exceptions of kidnapping, low carbohydrate diets, brainwashing and leaders who are sexual predators, can be found in unitarianism.The theology is fundamentally a rejection of Scripture and goes beyond the modalism and monarchianism et al found at times in the early church.
Although broad as a movement, it has a marked tendency towards liberal christianity which is unsurprising when you consider how ready it is to abandon substantial amounts of the Scriptures. It happily reduces God the Son to the status of a mere man or on occasions, to a vague, supernatural being.
It holds an optimistic view about 'the basic goodness of man' - it is at this point where even the most unscholarly Christian will see the basic flaws in their teachings.
The Arianism which underpins their beliefs has long been the 'mark of a cult'. Indeed, it is difficult in the extreme to find any cult which is not essentially unitarian in character.
Happily, their influence seems to be declining year on year.
