Dialogue and announcement, from the Vatican II are a double activity that the Church has developed, in an inherent way, with the new appeared religious approach since then. Even though the Church has dialogued, throughout its existence, with different kind of people to which it took the announcement of the Christian salvation, the gradual Inter- religious approach, that appears since Vatican Council II, brings new and generating elements of a considerable tension: it is given, doubtless, a shock , in the concrete participation of the dialogue, among the proposals of each religious tradition, for the solution of those questions that disturb the human being, in the closest of its being. Which is the origin? Which is the last end? Thus, the interest of this work is about the treatment with this double present aspect in the mission of the Church today: its participation in the Inter-religious dialogue, taking into consideration the requirements that are peculiar, however, fulfilling its duty to announce to the people the salvation brought by Jesus Christ.