Catholic Church and ecumenism
The Catholic Church has engaged in the modern ecumenical movement especially since the Second Vatican Council (1962-1965) and the issuing of the decree Unitatis redintegratio and the declaration Dignitatis humanae. It was at the Council that the Pontifical Council for Promoting Christian Unity was created. Those outside of the Catholic Church were categorised as heretics (in reference to Protestantism) or schismatics (as in the case of the Eastern Orthodox Church and Oriental Orthodox Churches), but in many contexts today, to avoid offence, the euphemism "separated brethren" is used. Definition Ecumenism, from the Greek word "oikoumene", meaning "the whole inhabited world" (cf. Acts 17.6; Mt 24.14; Heb 2.5), is the promotion of cooperation and unity among Christians. The Union of Christendom is a traditional Catholic view of ecumenism; the view is that every non-Catholic Christian ecclesial community is destined to return to the unity of the Catholic Church, from which it has broken. As the original Church founded by Jesus Christ according to Catholic doctrine, the Church sees itself as "the one true church". This means that according to such teaching, Christian unity is already a reality, present in the Catholic Church. The Catholic Church's commitment to ecumenism was based on