altitudinarian
/ˌaltɪˌtjuːdɪˈnɛːrɪən/ /ˌaltɪˌtʃuːdɪˈnɛːrɪən/rare
adjective
That is extreme in religious opinion, or carries a doctrine to an extreme height; especially that espouses High Church doctrine.
Origin
Mid 18th century; earliest use found in Thomas Birch (1705–1766), compiler of histories and biographer. From classical Latin altitūdin-, altitūdō altitude + -arian, after latitudinarian.