Establishmentarianism

[ih-stab-lish-muh n-tair-ee-uh n] /ɪˌstæb lɪʃ mənˈtɛər i ən/

adjective
1.
of or relating to an established church, especially the Church of England, or the principle of state religion.
2.
(often initial capital letter) of, relating to, or favoring a political or social .
noun
3.
a supporter or adherent of the principle of the of a church by state law; an advocate of state religion.
4.
(often initial capital letter) a person who belongs to or favors a political or social .
/ɪˌstæblɪʃmənˈtɛərɪən/
adjective
1.
denoting or relating to an Established Church, esp the Church of England
2.
denoting or relating to the principle of a Church being officially recognized as a national institution
noun
3.
an upholder of this principle, esp as applied to the Church of England
n.

“adherent of the principle of an established church,” 1846, from establishment.