A prolonged (yet telescoped) rendition of the chequered history of relations between Christianity and Islam, as each religious community operated out of different political contexts, illustrates diverse modes of interaction, from disputation to mutual illumination via a shared Hellenic philosophical tradition. A theological probe takes us to the heart of Christian teaching—the triune God—only to unveil remarkable affinities with Islamic developments regarding divine unity. The key to our entire exploration—intellectual humility—functions specially well here: recognizing the comparable logics of revelation, as well as acknowledging the power of these revelations to transform human beings into holy men and women, should motivate us to attempt to reconcile apparent contradictions between Abrahamic faiths in a manner similar to the way philosophical theologians of these traditions proceeded in the Middle Ages to reconcile their respective revelations with reason. A tactic axial to this analysis compares Qur'an with Jesus, rather than Qur'an and Bible, to show the fruitfulness of this more coherent approach. Support from both traditions for a pervasive attitude of intellectual humility shows how to open ways forward.