(a) Active participation in worship is had when one listens to a preacher, Sunday school teacher, etc., and signifies approval by joining in “Amens” or other acclamations.
(b) Participation is merely passive, if at church or over the radio, one listens out of curiosity, or in order to be able to refute errors, or for the sake of perfecting oneself in diction or eloquence, or of showing respect to a person whose funeral oration is being delivered, etc. But, even though there be no active participation, it will usually be unlawful to listen to these sectarian discourses on account of the danger of perversion to the listener or of scandal to others. Catholics who are scientifically trained and staunch in faith may for good reasons hear sectarian sermons, but the greater number would be disturbed or unsettled (see the principles given above on dangerous books and schools, 854-857, 868). Moreover, even those who have a right to listen to non-Catholic religious talks have to be on their guard against scandal, for outsiders may regard their attention as approval of doctrine or participation in cult, and Catholics not sufficiently instructed may regard their example as an encouragement to imitate (cfr. 979, 981).
974. Participation in non-Catholic assemblages or occasions whose character is of a mixed kind (partly religious and partly non-religious) are permitted by the Church, when due regard is had for avoidance of scandal, perversion, denial of faith, etc.
(a) Some of these occasions are chiefly religious, but are also looked on as family or civic solemnities, such as christenings, weddings, funerals. Hence, it is allowed to assist at the religious part of the occasion in a passive way for the sake of courtesy, or to exercise some function which is looked upon as belonging to the non-religious part of the occasion. Caution must be taken to ensure that the particular sect involved does not consider the exercise of the particular function as participating in the religious aspect of the ceremony. Likewise, on condition that the possibility of scandal, perversion, etc., has been removed, the following functions may be performed. One may act as a witness at the christening of a near relative who is not a Catholic; however, it is forbidden to be a sponsor, even by proxy, at baptisms performed by a heretical minister (Holy Office, decr., May 10, 1770). To be pallbearer or undertaker at a funeral, to be an usher at a wedding, to be an extra bridesmaid, etc., may be permitted. (If the function of best man or maid of honor be considered as merely attendants to the bride or groom, such participation in itself would not be illicit; but since the danger of scandal might often be present, such participation is dangerous. It is lawful for a Catholic pastor to attend the funeral of a non-Catholic friend or relative, provided he does not wear his sacred garb and takes no part in the ceremonies. Canon 1258, Sec.2 establishes the general norm regulative of these cases: a passive or merely material presence may be, for a serious reason, tolerated as a mark of esteem or social courtesy at funerals, weddings, and similar functions, provided there is involved no danger of perversion or scandal; in a doubtful case, the serious reason for this presence must be approved by the local Ordinary.
(b) Other occasions are chiefly non-religious in character, but are also partly religious, or have the appearance of being religious. Such are, for example, the coronation, birthday, wedding, or funeral of a ruler, school commencements, political conventions, patriotic meetings, civil marriage before a magistrate who is also a non-Catholic minister. When these exercises are chiefly non-religious or entirely civil, even though conducted in non-Catholic churches or by non-Catholic ministers, the Church grants permission to participate in them to some extent, if there is sufficient reason.
975. Among the mixed occasions just mentioned are not included such as have an anti-Catholic or anti-religious spirit, such as funerals from which all manifestations of religion are excluded on account of hatred of religion, entertainments held by forbidden societies in which the members are present in regalia, picnics under the auspices of the Orangemen, etc.
976. Cooperation in Religious Activities.—A third danger of making external profession of a false religion is cooperation in activities whose tendency or principles are erroneous (see 944). Cooperation in a false religion is of two kinds, immediate and mediate. (a) Cooperation is immediate, when one takes a part in an act of a false religion itself (e.g., by worshipping an idol). This kind of cooperation was discussed above, as participation or communication (see 956-975). (b) Cooperation is mediate, when one takes part, not in an act of a false religion, but in some other act which is a preparation for a help to the act of a false religion. This is the kind of cooperation we are now considering.
977. Mediate cooperation is of various kinds. (a) It is proximate or remote, according as the preparation or help afforded to false religion is near to or far from the religious act. Thus, to make ready the lights, incense, flowers, etc. in front of an idol is proximate cooperation; to give money to an idolatrous priest or bonze is remote cooperation. (b) Mediate cooperation is material or formal, according as the intention of the cooperator is to share in or help error itself, or merely to help those who are in error, while disapproving of their error. Thus, if one prepares a pagan temple for worship or contributes money towards its maintenance because one’s sympathies are with its idolatry, one’s cooperation is formal; if one does these things only in order to make a living or to show friendship to an individual pagan, one’s cooperation is material. It is clear that formal cooperation is a grave sin against faith, and hence we shall speak now only of material cooperation.
978. The principles governing the lawfulness of material cooperation will be treated at length below in their proper place among the sins opposed to charity. But since, on account of the mixed conditions of society today, there are innumerable cases of material cooperation in religion, it will be useful to state in advance in this place the principles bearing on material cooperation and their application to cases on religion and worship. The principles are the same as those given for an act that has two effects, one good and the other bad. Hence, material cooperation is not lawful, except when the following conditions are present:
(a) The action of him who cooperates must be good in itself or at least indifferent, for of course, if it is evil, it is not lawful. Thus, if a person were to give to one pagan temple objects he had stolen from another temple, his action would be intrinsically sinful on account of the theft. Similarly, if a person were to contribute to a collection list as “sympathizer” with a school for the propagation of atheism or as “beneficiary” from the sacrifices to be offered an idol, his act would be intrinsically sinful as being a promotion of error or superstition, even though he were not really a sympathizer with atheism or a believer in idols.