The sociocultural and religious challenges in our present day urban context require a theological revision in the Catholic Church s pastoral action. The fragmentation of the Brazilian religious universe has marked the logic of action and religious practice in different branches of Catholicism. On the one hand, we may find the imperative of subjectivism; on the other hand, a pre-urban pastoral. Both of them are posed as challenges to meet the demands of this context. This dissertation aims at redescovering the adults Christian initiation and its potential for evangelization. It departs from the principle that if we rediscover the fundamentals of the catecumenate as an essential function of the Church and, if we discover both an initiation and reinitiation of adults Christian faith based on a permanent personal contact as reference to the Kingdom and justice, we will then have a new ecclesiastic paradigm to revitalize the Catholic Church in our times. The main point in this work is to show that if the Church does not change, the catechism will not change and vice versa. The adult catechize is the only way to help with the rebirth of an adult Church. We also believe that the Rite of Christian Initiation of Adult s (RCIA) is a privileged instrument of the Church as it helps those who come or return to Live Christ s Pascal Ministry by means of the pastoral experience it involves − biblical, liturgical, communitarian, pastoral and solidarian. Finally, we can affirm that the Church is definitely the environment where the coming and return to Christ may come true.