The saints are the tradition's most visible Catholic-Protestant divide, and the disagreement is narrower than it looks: all sides honor exemplary Christians, and the dispute is over whether the living may ask them to pray. Catholic and Orthodox teaching says yes and distinguishes carefully between veneration and worship; the Reformers rejected the practice as unbiblical and as competing with Christ's sole mediation. Canonization is a formal legal process in the Catholic church, with evidence, advocates, and historically an appointed opponent — the devil's advocate.