As Christians we proclaim a common Creed but are diverse in matters of doctrine; quite close in christian behaviour and life, but different in matters of church policy, organisation, management, the decision-making procedures, democracy, the ordination of woman, the relation to the State and to political society. Hence the questions : is it possible to overcome doctrinal diversity ? Is it still a real and existentional impediment or an obstacle for unity ? Or – on then contrary - is diversity rather a grace and a necessity and needed to respond to different cultural lives and particular customs ? What kind of conditions are at stake when it comes to being in communion ?