Ecumenism only talks about Christians – where there is unity in Truth and Sanctification. We believe there is certain (“true”) but incomplete union between RCC and other Christians. Ecumenism is about Sacramental reality – not about human relations. What unites us is greater than what divides us and we must act on it and acknowledge Truth where we find it.
Paul XI’s “Circles of Dialog” (taught in seminaries as “The Onion”) starts with the Catholic Church in the center . . . the next layer out is all who believe in Christ . . next is all who believe in God . . .then the rest of humanity on the outside layer…
V2’s theology of ecumenism brings it more into focus:
- The one Church of Christ subsists in the Catholic Church
- Some Truth & sanctification does exist outside the Catholic Church as the Church of Christ is present & operative in those who preserve Apostolic succession (as they have full Sacramental life)
- Protestant communities are used as means of salvation by the Holy Spirit in those elements preserved from the RCC.
So we SHOULD do all things together EXCEPT those which in conscience we must do separately. For instance, we can pray together, share resources for spiritual life & activity, and share non-Sacramental worship . . .but we cannot yet share the Holy Mass as an “open table” with Protestants as we are not in union. . . at least, not yet!
For more info, you can look up the Directory on the application of Principles and Norms on Ecumenism (DAPNE) which was written by the Pontifical Council for Promoting Christian Unity (PCPCU) . . .it’s the 1993 Ecumenical Directory.