One of the key marks of the Church mentioned in the Apostles’, Nicene, and Athanasian Creeds is catholicity: “I believe in one holy, catholic, and apostolic Church.”1 This reflects the New Testament’s emphasis on the Church’s universality, unity, and harmony as delivered by the Holy Spirit. Humans are sinful and remain so even after being converted to the faith. As a result, resistance to the Spirit can disrupt this unity. However, sin can never ultimately shatter the fundamental unity of the catholic Church. Hence, in his high priestly prayer, Jesus famously prays that “they [the Church] may all be one, just as you, Father, are in me, and I in you, that they also may be in us, so that the world may believe that you have sent me” (Jn. 17:21). Similarly, Paul spends most of 1 Corinthians advising the congregation at Corinth to humbly put aside their differences under the cross and engage in practices that will promote unity, as opposed to division, in the body of Christ.
Modern Christian theologians treat many of these calls for unity in the New Testament as carte blanche orders to impose institutional unity on the Church.2 However, these passages must be counterbalanced by calls for members of the Church to separate themselves from the wicked (Matt. 18:17, 1 Cor. 5, 2 Cor. 6:14, 1 Jn. 2:19, Rev. 18:4). We often think of sin primarily in terms of individual actions that violate the commands to love our neighbor in the second table of the Ten Commandments. Yet, we just as frequently violate the commands of the first table of the law. This occurs when Christians spread or embrace false teachings about God and fail to honor and love him above all things. Sins against the first table of the law also constitute “wickedness.” Heresy, therefore, cannot be tolerated in the body of Christ, and separation must occur on an individual or corporate scale when false teaching occurs.
The New Testament admonishes believers not to have fellowship with those in grave moral error. It follows that Christians cannot have fellowship with groups or individuals who error in the fundamental articles of the faith. For example, St. Paul is quite clear that Christians should not participate in pagan worship or have fellowship with those who engage in such worship (1 Cor. 10:18-22). Participation in sacrifice to an idol and the consumption of sacrificed meat in an idolatrous setting is an act of fellowship with those who worship false gods and through them have unwitting fellowship with demons. Paul also compares the false fellowship of pagan worship with real communion with the true God conveyed by the sacrifices of the old covenantal order (1 Cor. 10:18), as well as the Christian Eucharist (1 Cor. 10:14-17).3
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