Английский Этимологический словарь - antidisestablishmentarianism

- 1838, said by Weekley to be first recorded in Gladstone's "Church and State," "in reference to a scheme directed against the Church of England," from establishment in the sense of "the ecclesiastical system established by law; the Church of England" (1731). Hence, establishmentarianism "the principle of a state church," and disestablish (1598) "to deprive (a church) of especial state patronage and support," first used specifically of Christianity in 1806.