In my book “Was the Reformation a Mistake? Why Catholic Doctrine Is Not Unbiblical,” I aim to show that even if one disagrees with judgments made in the course of Catholic doctrinal development, the Catholic positions on nine disputed doctrines (Scripture, Mary, the Eucharist, the Seven Sacraments, monasticism, justification and merit, purgatory, saints and papacy) should not be rejected as unbiblical or as lacking in biblical grounding — at least given the Catholic view of biblically warranted modes of biblical reasoning.
Before proceeding, let me make some additional observations about whether the Reformation was a “mistake,” as my book’s title asks in light of the Reformation’s 500th anniversary.