They are always joined together, as noted in this recent address by the Holy Father and in the doctrinal document Dominus Iesus.
An excerpt from the Vatican Information Service about the Holy Father’s address.
“Vatican City, (VIS) – The close ties between the work of evangelisation and the need to overcome the divisions that still exist between Christians was the central theme of this morning’s address by the Holy Father to the members and consultors of the Pontifical Council for Promoting Christian Unity on the occasion of their plenary assembly dedicated to “The importance of ecumenism in new evangelisation”….
“It is good to journey together towards this objective, provided that the Churches and ecclesial communities do not stop along the way, accepting the various contradictions between them as normal or as the best they can hope to achieve. It is, rather, in the full communion of faith, Sacraments and ministry that the strength of God, present and working in the world, will find concrete expression”.
“The Pope concluded, “Unity is on the one hand the fruit of faith and, on the other, a means – almost a prerequisite – for an increasingly credible proclamation of the faith to those who do not yet know the Saviour or who, while having received the proclamation of the Gospel, have almost forgotten this valuable gift. True ecumenism, recognising the primacy of divine action, demands above all patience, humility, and abandonment to the will of the Lord. In the final analysis, ecumenism and new evangelisation both require the dynamism of conversion, understood as the sincere desire to follow Christ and to fully adhere to the will of the Father”.
An excerpt from Dominus Iesus.
“21. With respect to the way in which the salvific grace of God — which is always given by means of Christ in the Spirit and has a mysterious relationship to the Church — comes to individual non-Christians, the Second Vatican Council limited itself to the statement that God bestows it “in ways known to himself”. Theologians are seeking to understand this question more fully. Their work is to be encouraged, since it is certainly useful for understanding better God’s salvific plan and the ways in which it is accomplished. However, from what has been stated above about the mediation of Jesus Christ and the “unique and special relationship” which the Church has with the kingdom of God among men — which in substance is the universal kingdom of Christ the Saviour — it is clear that it would be contrary to the faith to consider the Church as one way of salvation alongside those constituted by the other religions, seen as complementary to the Church or substantially equivalent to her, even if these are said to be converging with the Church toward the eschatological kingdom of God.
“Certainly, the various religious traditions contain and offer religious elements which come from God, and which are part of what “the Spirit brings about in human hearts and in the history of peoples, in cultures, and religions”. Indeed, some prayers and rituals of the other religions may assume a role of preparation for the Gospel, in that they are occasions or pedagogical helps in which the human heart is prompted to be open to the action of God. One cannot attribute to these, however, a divine origin or an ex opere operato salvific efficacy, which is proper to the Christian sacraments.Furthermore, it cannot be overlooked that other rituals, insofar as they depend on superstitions or other errors (cf. 1 Cor 10:20-21), constitute an obstacle to salvation.”