The only objective standard possible, the words of the religions themselves, combined into one greater piece of theology. Everything is assumed true unless it conflicts a greater set of doctrine.<p>Thus we <i>know</i> mormon leadership speak ex-cathedra because Smith said so, and so forth. Where things conflict however, like Mohammed&#x27;s statement that he&#x27;s the last prophet, obviously he&#x27;s wrong because Joseph Smith, etc, meet the same criteria.<p>Going by the truth revealed in each document, Mormon&#x27;s are the closest to god - the latest, most direct, pipeline to the divine. It&#x27;s essentially religious science.