Non-denominational evangelical churches share a firm commitment that the biblical canon is closed and that Scripture is the supreme and final authority for Christian faith and practice. No new inspired writings can supplement or replace the biblical canon. Beyond this shared baseline, however, the movement is divided on whether God continues to communicate through spiritual gifts such as prophecy, tongues, and words of knowledge.

Cessationist non-denominational churches hold that revelatory and miraculous gifts ceased with the apostolic era, so that the only ongoing normative revelation is Scripture. Continuationist churches hold that the Spirit continues to speak through spiritual gifts, but these communications are always subordinate to Scripture and must be tested against the written Word. The continuationist position is increasingly common, especially among non-denominational churches influenced by the charismatic renewal.

A minority of non-denominational evangelical churches affiliated with the New Apostolic Reformation (NAR) grant heightened authority to contemporary apostles and prophets, in ways that critics argue effectively elevates extra-biblical revelation to near-canonical status. This represents a controversial fringe within the broader non-denominational evangelical world and is rejected by many evangelical leaders.