Secularism draws its intellectual roots from Greek and Roman philosophers such as Marcus Aurelius and Epicurus; medieval Muslim polymaths such as Ibn Rushd; Enlightenment thinkers such as Denis Diderot, Voltaire, Baruch Spinoza, John Locke, James Madison, Thomas Jefferson, and Thomas Paine; and more recent freethinkers, agnostics, and atheists such as Robert Ingersoll and Bertrand Russell.
The purposes and arguments in support of secularism vary widely. In European laicism, it has been argued that secularism is a movement toward modernization, and away from traditional religious values (also known as secularization). This type of secularism, on a social or philosophical level, has often occurred while maintaining an official state church or other state support of religion. In the United States, some argue that state secularism has served to a greater extent to protect religion and the religious from governmental interference, while secularism on a social level is less prevalent. Within countries as well, differing political movements support secularism for varying