Both need each other: The agnostic cannot be content to not know, but must be in search of the great truth of faith; the Catholic cannot be content to have faith, but must be in search of God all the time, and in the dialogue with others, a Catholic can learn more about God in a deeper fashion.
Pope Benedict XVI[Non-Catholic Christians are] in a gravely deficient situation in comparison with those who, in the [Roman Catholic] church, have the fullness of the means of salvation.
Pope Benedict XVIToday, having a clear faith based on the Creed of the Church is often labeled today as fundamentalism. Whereas relativism, that is, letting oneself be "tossed here and there, carried about by every wind of doctrine," seems the only attitude that can cope with modern times.
Pope Benedict XVI