Authority is central to Christian ethics because Christians must decide who or what should determine moral truth. The Roman Catholic Church argues that Church teaching should have authority because Christ entrusted the apostles and their successors with preserving and interpreting divine revelation. Through the Magisterium, guided by the Holy Spirit, the Church teaches authoritatively on moral issues, and Scripture and Tradition are seen as complementary sources of revelation. In contrast, most Protestant traditions reject this, defending sola scriptura: the belief that Scripture alone is the supreme authority, while Church teaching is valuable only insofar as it faithfully explains biblical teaching. The debate is therefore not about whether the Church has an important role, but whether it possesses authority in its own right. This essay will argue that Church teaching should have no independent authority in Christian ethics because only Scripture is uniquely inspired by God, the Church has repeatedly shown itself to be historically fallible, and although the Church is indispensable in preserving and interpreting Scripture, it should remain accountable to God’s Word rather than exercising authority over it.

The strongest reason for rejecting the authority of Church teaching is that only Scripture possesses divine inspiration. Protestants appeal to 2 Timothy 3:16, which teaches that “all Scripture is God-breathed”, arguing that while churches, councils and popes are human institutions capable of error, Scripture alone is God’s revealed Word. This conviction lay at the heart of Martin Luther’s challenge to the medieval Church. Luther argued that popes and councils had often contradicted one another, demonstrating that ecclesiastical authority could not be infallible. Consequently, he insisted that his conscience was “captive to the Word of God”, not to the Church. If Scripture is inspired while Church teaching is not, then granting both equal authority risks allowing human opinion to rival divine revelation. This does not mean the Church is unnecessary. Protestants have always recognised the importance of preaching, teaching and theological reflection. However, these activities derive their authority from Scripture rather than possessing authority independently. Critics argue that this places too much confidence in individual interpretation, yet Protestant thinkers such as Calvin respond that the Holy Spirit works directly in believers through the internal testimony of the Holy Spirit, enabling Christians to recognise and understand God’s Word. Although sincere Christians may disagree on difficult issues, the possibility of disagreement does not justify transferring authority from God’s revelation to a human institution. Instead, it reinforces the need for humility and continual return to Scripture. Therefore, Church teaching should be respected as an aid to understanding Scripture but should never become an independent source of moral authority.

A second reason why Church teaching should not possess authority is that history demonstrates its fallibility. If the Church were an infallible moral authority, its ethical teaching would be expected to display consistency across time. Instead, many teachings have developed significantly. Attitudes towards lending money at interest, religious freedom and slavery have all changed, while contemporary debates over sexuality, gender and bioethics continue to generate disagreement even within the Roman Catholic Church. Catholics may explain these developments through Newman’s idea of the development of doctrine, arguing that the Church grows in its understanding of eternal truths without abandoning them. However, this response unintentionally weakens the claim that Church teaching deserves independent authority. If moral teaching develops because of new historical circumstances and deeper reflection, then it is difficult to argue that every previous teaching carried unquestionable authority. Rather, Church teaching appears capable of correction, refinement and even reversal. This suggests that its authority is provisional rather than absolute. By contrast, Scripture remains the fixed point against which all later teaching must be measured. Karl Barth expressed this relationship by insisting that the Church always stands under the authority of the Word of God rather than above it. The Church exists to hear, proclaim and obey God’s revelation, not to replace it. Consequently, Christian ethics is best protected when the Church recognises its proper role as interpreter and servant of Scripture rather than as an independent authority capable of defining morality for itself.

Nevertheless, the Roman Catholic case presents a serious challenge to this conclusion. Catholics argue that the Church’s authority actually precedes Scripture. Christ founded the Church before the New Testament existed, commissioned the apostles to teach in his name and promised that the Holy Spirit would guide them into all truth. Furthermore, the canon of Scripture did not fall from heaven fully formed. It was recognised by councils of the early Church, such as Hippo and Carthage, meaning that Christians accept the Bible because the Church identified which books belonged within it. Biblical criticism strengthens this argument by showing that Scripture is neither simple nor self-interpreting. Different literary genres, historical contexts and apparent contradictions require careful interpretation, while the existence of thousands of Protestant denominations suggests that sola scriptura has not produced doctrinal unity. Catholics therefore argue that the Holy Spirit guides the Magisterium so that authentic interpretation remains possible and Christian ethics is protected from confusion and relativism. This is undoubtedly the strongest defence of Church authority because it addresses genuine weaknesses within Protestantism. However, it does not ultimately establish that Church teaching should possess authority in its own right. The early Church did not create Scripture but recognised the books that were already inspired by God; recognising authority is not the same as originating it. Likewise, the need for interpretation does not imply the existence of an infallible interpreter. The same Holy Spirit who guided the early Church in recognising the canon is also promised to the whole body of believers, not exclusively to bishops or popes. Indeed, if the Spirit prevented error within the Magisterium, it becomes difficult to explain why Catholic moral teaching has itself developed over time. Biblical criticism demonstrates the complexity of interpretation, but complexity is not evidence that authority belongs to the Church rather than to Scripture. Instead, it highlights the need for faithful scholarship, communal discernment and intellectual humility. Church teaching therefore deserves significant respect because of its wisdom, historical continuity and theological expertise, but respect should not be confused with authority. The Church remains accountable to Scripture, not its master.

In conclusion, Church teaching should have no independent authority in Christian ethics because only Scripture is uniquely inspired by God and therefore capable of functioning as the final standard for Christian moral decision-making. The Church undoubtedly plays an essential role in preserving the biblical canon, teaching believers and helping Christians interpret difficult passages, and the Catholic emphasis on the guidance of the Holy Spirit rightly reminds Christians that faith is lived within a community rather than in isolation. Nevertheless, these important functions do not justify granting the Church authority equal to or above Scripture. History demonstrates that Church teaching is capable of development and correction, whereas Scripture remains the enduring measure against which every tradition must be judged. Christians should therefore value the Church as a faithful teacher and interpreter, but continually test every ethical claim against God’s revealed Word, ensuring that the Church remains the servant of Scripture rather than its sovereign.