Personal ordinariate
If membership by reception of the sacraments of initiation within an ordinariate is open not only to the Catholics mentioned in the 2013 amendment but to others also who have no Anglican background - something on which no express statement has been issued - anyone who has not yet received all three sacraments of initiation may join. This includes non-Christians, those who, in the view of the Catholic Church, do not have valid baptism (such as Mormons), and those who, again in the view of the Catholic Church, have valid baptism but not valid confirmation or Eucharist. Protestants in general are seen as lacking valid confirmation, but the Eastern churches and some Western ones, such as some Old Catholic churches and the Polish National Catholic Church, are recognized as having valid sacraments.
Catholic Church
In the first thousand years of Catholic history, different varieties of Christianity developed in the Western and Eastern Christian areas of Europe. Though most Eastern-tradition churches are no longer in communion with the Catholic Church after the Great Schism of 1054, autonomous particular churches of both traditions currently participate, also known as "churches "sui iuris"" ("). The largest and most well known is the Latin Church, the only Western-tradition church, with more than 1 billion members worldwide. Relatively small in terms of adherents compared to the Latin Church, are the 23 self-governing Eastern Catholic Churches with a combined membership of 17.3 million .