Religious skepticism is a type of skepticism

Skepticism

Skepticism has many definitions, but generally refers to any questioning attitude towards knowledge, facts, or opinions/beliefs stated as facts, or doubt regarding claims that are taken for granted elsewhere...

 relating to religion

Religion

Religion is a collection of cultural systems, belief systems, and worldviews that establishes symbols that relate humanity to spirituality and, sometimes, to moral values. Many religions have narratives, symbols, traditions and sacred histories that are intended to give meaning to life or to...

, but should not be confused with atheism

Atheism

Atheism is, in a broad sense, the rejection of belief in the existence of deities. In a narrower sense, atheism is specifically the position that there are no deities...

. Religious skeptics question religious authority and are not necessarily anti-religious but are those skeptical of a specific or all religious beliefs or practices. Some are deists, believing in a God but rejecting mainstream religions. Socrates

Socrates

Socrates was a classical Greek Athenian philosopher. Credited as one of the founders of Western philosophy, he is an enigmatic figure known chiefly through the accounts of later classical writers, especially the writings of his students Plato and Xenophon, and the plays of his contemporary ...

was one of the first religious skeptics of whom we have records; he questioned the legitimacy of the beliefs of his time in the existence of the various gods.