The Georgian Apostolic Autocephalous Orthodox Church (, sak’art’velos samots’ik’ulo avt’okep’aluri mart’lmadidebeli eklesia) is an autocephalous Eastern Orthodox Church. It is Georgia's dominant religious institution, and a majority of Georgian people affirm their membership in the Church. It asserts apostolic foundation, and its historical roots can be traced to the conversion of the Kingdom of Iberia to Christianity in the 4th century AD. Christianity, as embodied by the Church, was the state religion of Georgia until 1921, when a constitutional change separated church and state.