The Catholic Church considers the Eastern Orthodox to be in schism and therefore not in [[full communion]] with the [[Holy See]]. Some of Eastern Orthodox Christians in turn consider Roman Catholics to be heretics, while the majority consider them in schism.
Confusingly, the term "Western Orthodox" refers to [[Uniat]] Catholic churches in communion with the [[Holy See|Roman See]], known also as Eastern Catholic Churches. Actually this is rarely the case in semantic terms. Today "western Orthodox" will probably refer to groups of apostolic Orthodox Christians in the UK, USA, and perhaps smaller numbersin France, the Netherlands, Germany and Denmark, who wish to be Orthodox and yet want a western and Latin rite. In Ukraine and Romania there are Uniates called Greek Catholics who have Byzantine rite, but accept primacy of the Pope, and Papal infallibility, so they are Byzantine Catholics. Also in the Lebanon are groups called Maronites and Melkites in a smilar situation.
The Catholic Church considers all forms of Protestantism to be heresy or at the least, in error (since they do not have apostolic succession and thus their "rite" and ordinations are invalid); some Protestants are mutually hostile and consider Roman Catholics, and sometimes Eastern Orthodox, to be heretics. In some cases the term ''apostasy'' is applied within mutual invectives. The Catholic Church, since the [[Second Vatican Council]], has been working harder to effect rapprochement among diverse forms of Christianity; these efforts have been met with wide-ranging responses. Some religious groups are considered by all of the aforementioned to be unorthodox (or even arbitrarily ''[[cult]]s'', as they are less commonly called in Protestant circles), including members of the Church of Jesus Christ of Latter Day Saints or [[Mormon]]s, [[Jehovah's Witnesses]], [[Unitarianism|Unitarians]], and some of the more radical forms of [[Liberal Christianity|liberal theology]].