This article provides a constructive reading of Barth's interpretation of Romans 2 in the Römerbrief in conversation with his treatment of the sinful human attempt to construct a worldview in opposition to the saving activity of Jesus in Church Dogmatics IV/3. I argue that dialectical theology provides Western Christianity with a hermeneutical approach against whiteness grounded in a Reformational theology of justification by faith alone. In this way, dialectical theology is a resource for constructing Christian identity free of whiteness as well as for carving out new space for a decolonial option within Christian theology.