Irenaeus on the Christian Faith is James Payton’s condensation of the church father’s magnum opus, Against Heresies. Irenaeus, a theologian of the second century, presents a defense and presentation of the Christian faith against Gnosticism. In Book I of Against Heresies, Irenaeus painstakingly describes the gnostic teaching. He responds negatively in Book II by offering a thorough refutation. He then responds positively in Books III-V by presenting what Christians believe from the Apostles’ Teachings (Book III) and from the words of Christ (Book IV). Book V serves as an addendum, where Irenaeus adds “further teaching” from Christ and the Apostles. James Payton finds Irenaeus’ presentation of the Christian faith beneficial and edifying even for believers who are a couple millennia removed from the dangers of first century Gnosticism.