Although the three “Isms” of postmodernism, polytheism, and the ancient heresy of Gnosticism seem unrelated, this booklet shows that all three are part of the ancient religious worldview of Creator-denying "Oneism"— that seeks to impose significant elements of a pagan civilization on our once "Christian" Western culture. Peter Jones, a commentator on pagan influences in our culture, shows us what these three “-Isms” are, how they have morphed into new forms in modern culture, and what effects they are having. With a clearer understanding of the coherence of this opposing spiritual system, which comes in many forms, Christians will be empowered to make a clear and fearless declaration of the superiority of biblical "Twoism"—that God is utterly separate from his creation—and promote the gospel of reconciliation with the personal Creator through the atoning blood of the only mediator, Jesus.