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.