Greek Orthodoxy is the prevailing religion of Greece, emphasised by displays of the Greek flag and national emblem.
Adherence to the Eastern Orthodox Church was established as a definitive hallmark of Greek ethnic identity already in the first modern Greek constitution, the "Epidaurus Law" of 1822, during the Greek War of Independence. The preamble of all successive Greek constitutions simply states "In the name of the Holy, Consubstantial and Indivisible Trinity", and the Eastern Orthodox Church of Christ is established as the "prevailing" religion of Greece.
Mainstream Orthodox clergy's salaries and pensions are paid for by the State at rates comparable to those of teachers. The Church had previously compensated the State by a tax of 35% on ordinary revenues of the Church, but Law 3220/2004 in 2004 abolished this tax. By virtue of its status as the prevailing religion, the canon law of the Church is recognized by the Greek government in matters pertaining to church administration. This is governed by the "Constitution of the Church of Greece", which has been voted by Parliament into law. Religious marriages and baptisms are legally equivalent to their civil counterparts and the relevant certificates are issued by officiating clergy. All Greek Orthodox students in primary and secondary schools in Greece attend religious instruction. Liaisons between church and state are handled by the Ministry of National Education and Religious Affairs.
The religious jurisdictions of the Greek Orthodox Church in Greece.
Supreme authority is vested in the synod of all the diocesan bishops who have metropolitan status (the Holy Synod of the Church of Greece, Greek: Ἱερὰ Σύνοδος τῆς Ἐκκλησίας τῆς ἙλλάδοςHierà Sýnodos tês Ekklēsías tês Helládos[ieˈra ˈsinoðos tis ekliˈsias tis eˈlaðos]) under the de jure presidency of the Archbishop of Athens and all Greece. This synod deals with general church questions. The Standing Synod is under the same presidency, and consists of the Primate and 12 bishops, each serving for one term on a rotating basis and deals with details of administration.
The church is organised into 81 dioceses; 36 of which, located in northern Greece and in the major islands in the north and northeast Aegean, are nominally and spiritually under the jurisdiction of the Ecumenical Patriarchate of Constantinople, which retains certain privileges over and in them—for example, their bishops have to acknowledge the Patriarch as their own primate during prayers. They are called the "New Lands" (Νέαι Χώραι, or Néai Chōrai) as they became part of the modern Greek state only after the Balkan Wars, and are represented by 6 of the 12 bishops of the Standing Synod. A bishop elected to one of the Sees of the New Lands has to be confirmed by the Patriarch of Constantinople before assuming his duties. These dioceses are administered by the Church of Greece "in stewardship" and their bishops retain their right of appeal (the "ékklēton") to the Patriarch.
As in other Eastern Orthodox Churches, male graduates of seminaries run by the church (and financed by the Greek State), may be ordained as deacons and eventually priests. They are allowed to marry before their ordination as deacons, but not afterwards. The vast majority of parish clergy in Greece are married. Alternatively, they may enter monasteries and/or take monastic vows. Monastics who are ordained as priests, and possess a university degree in theology, are eligible as candidates for the episcopate (archimandrites). Women may also take monastic vows and become nuns, but they are not ordained.
Monasteries are either affiliated to their local diocese, or directly to one of the Orthodox Patriarchates; in the latter case they are called "Stauropegiac" monasteries (Stayropēgiaká, "springs of the Cross").
A split (schism) occurred within the Church in 1924 when the Holy Synod decided to replace the Old Calendar (Julian) with a hybrid calendar—the so-called "Revised Julian Calendar"—which maintained a modified Julian dating method for Easter while adopting the Gregorian Calendar date for fixed feasts. Those who refused to adopt this change are known as Old Calendarists (palaioimerologites in Greek) and still follow the old Julian Calendar. They themselves have suffered several schisms, and not all Old Calendarists comprise one Church. They refer to themselves as "Genuine Orthodox Christians", and the largest group associating itself with the Old Calendarists is the Synod of Archbishop Chrysostomos II Kioussis. This Synod has obtained government recognition as a valid Orthodox Church, although this is not in communion with the Church of Greece or the other Eastern Orthodox Churches.