Neither religious nationalism nor religious ecumenism or internationalism is the fulness of the faith. Rather, in dialectical form, nationalism presumes to limit the faith to a category more narrow than the Church, and ecumenism/internationalism presumes to expand the faith beyond the Church’s boundaries. In both cases, a false category is created and a false ecclesiology proffered. So, the proper view is not nationalism vs. ecumenism and internationalism:
Nationalism <——————————-> Internationalism/Ecumenism
but both as ecclesiological heresies against the Church:
Nationalism
Internationalism <——————————-> The Church
Ecumenism