Benjamin Rush, a Trinitarian Universalist, wasn't one of those religiously correct folks. His universalism made him a dissenter.
Below is the quotation from July 18 1792:
There is a propensity in all sciences to simplify themselves and to ascribe that to one which should be divided among many causes. For example, how few sects honor Father, Son and Holy Ghost in religion as they should do. The Socinians honor the Father only; the Catholics the Saviour chiefly, and the Quakers the Holy Spirit above both; how few include all the ends of our Saviour's death in their belief of the Atonement; each contends for one end only while six or seven other ends are clearly revealed in the Scriptures; many exalt one power or one set of powers only in the mind instead of all, many confine religion to one power only instead of applying it to all. The Episcopalians to the understanding, the Methodists to the passions and the Quakers the moral powers.Socinians, Catholics and Quakers each were controversial in their own right. That Rush includes Socinians as a "Christian" sect demonstrates his sympathy with the dissenters and against the orthodox forces of religious correctness that would deny them such label.