Which Version Of Christianity Is The Correct One?

[Confused Ape]

Eastern Orthdox Church - Relations With Other Christians

The Orthodox understand themselves to be the One Holy Catholic and Apostolic Church; the true Church established by Jesus Christ and placed into the care of the apostles. As almost all other Christian groups are in indirect schism with the Orthodox Church, mostly as a result of the Great Schism with the Roman Catholic Church at the turn of the second Christian millennium (prior to the additional schisms of the Protestant Reformation), these other groups are viewed as being Christian, but who in varying degrees lack full theological orthodoxy and orthopraxy.

As such, all groups outside of the Orthodox Church are not seen as being members of the Church proper, but rather separated brethren who have failed to retain the fullness of the Christian faith and theology, as was given to the apostles by Jesus Christ. These deviations from orthodoxy have traditionally been called heresy, but due to the term's immediately pejorative connotations, some prefer the more technical designation of the term heterodoxy.

So, other Christians aren't members of the 'true' church, including the Roman Catholics.