Religious skepticism is a type of skepticism relating to religion. Religious skeptics question religious authority and are not necessarily anti-religious but skeptical of specific or all religious beliefs and/or practices. Socrates was one of the most prominent and first religious skeptics of whom there are records; he questioned the legitimacy of the beliefs of his time in the existence of the Greek gods. Religious skepticism is not the same as atheism or agnosticism, and some religious skeptics are deists (or theists who reject the prevailing organized religion they encounter, or even all organized religion).