Abortion. Euthanasia. Pornography. Same-sex marriage. Transgender rights. Embryonic research. Genetic enhancement. Christians surveying the cultural landscape in the West have a clear sense that things are headed in a destructive direction. While most believers can easily identify the symptoms of decline, few feel competent to diagnose and address the root causes. There are many complex factors behind these developments, but one invaluable tool for better understanding and engaging with our culture is the concept of worldview. The sociological quakes and moral fissures we observe in our day are largely due to what we might call “cultural plate tectonics”: shifts in underlying worldviews and the collisions between them.