CCC 2108 The right to religious liberty is neither a moral license to adhere to error, nor a supposed right to error,1 but rather a natural right of the human person to civil liberty, i.e., immunity, within just limits, from external constraint in religious matters by political authorities. This natural right ought to be acknowledged in the juridical order of society in such a way that it constitutes a civil right.2

1 Cf. Leo XIII, Libertas praestantissimum 18; Pius XII AAS 1953, 799.
2 Cf. DH 2.