 It is a neologism (or retronym) that gained increasing currency in nontrinitarian literature during the 20th century as the mainstream Unitarian churches moved away from belief in the Bible and, in the United States, towards merger with Universalism.It has been used since the late 19th century by conservative Christian Unitarians, and sometimes by historians, to refer to Scripture-fundamentalist Unitarians of the 16th–18th centuries.Its use is problematic in that Unitarians from the 17th to the 20th centuries all had attachment to the Bible, but in differing ways.