Religious skepticism is a type of skepticism relating to religion. Religious skeptics question religious authority and are not necessarily  anti-religious but are those skeptical of a specific or all religious beliefs and/or practices. Some are deists, believing in a non-interventionist god(s) and rejecting mainstream religions. Socrates was one of the 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.