2. Certainly the curtailment of the religious freedom of individuals and communities is not only a painful experience but it is above all an attack on man's very dignity, independently of the religion professed or of the concept of the world which these individuals and communities have. The curtailment and violation of religious freedom are in contrast with man's dignity and his objective rights. In this case we are undoubtedly confronted with a radical injustice with regard to what is particularly deep within man, what is authentically human. Indeed, even the phenomenon of unbelief, a-religiousness and atheism, as a human phenomenon, is understood only in relation to the phenomenon of religion and faith. It is therefore difficult, even from a "purely human" point of view, to accept a position that gives only atheism the right of citizenship in public and social life, while believers are, as though by principle, barely tolerated or are treated as second-class citizens or are even, and this has already happened, entirely deprived of the rights of citizenship. (Papal Encyclical, Redemptor hominis, 4 March 1979).