In the early years of Christianity, the Neoplatonic philosopher Porphyry emerged as one of the major critics with his book "Against the Christians". Porphyry argued that Christianity was based on false prophecies that had not yet materialized. Following the adoption of Christianity under the Roman Empire, dissenting religious voices were gradually suppressed by both governments and ecclesiastical authorities. A millennium later, the Protestant Reformation led to a fundamental split in European Christianity and rekindled critical voices about the Christian faith, both internally and externally. With the Scientific Revolution and the Age of Enlightenment, Christianity was criticized by major thinkers and philosophers, such as Voltaire, David Hume, Thomas Paine, and the Baron d'Holbach. The central theme of these critiques sought to negate the historical accuracy of the Christian Bible and focused on the perceived corruption of Christian religious authorities. Other thinkers, like Immanuel Kant, launched systematic and comprehensive critiques of Christian theology by attempting to refute arguments for theism.