Henotheism (Greek ἑνας θεός henas theos "one god") is the belief in and worship of a single god while also believing in the existence or possible existence of other deities.Friedrich Schelling (1775–1854) originally coined the word, and Friedrich Welcker (1784-1868) used it to depict primordial monotheism among ancient Greeks.
Max Müller (1823–1900), a German philologist and orientalist, brought the term into wider usage in his scholarship on the Indian religions. Müller made the term central to his criticism of Western theological and religious exceptionalism (relative to Eastern religions), focusing on a cultural dogma which held "monotheism" to be both fundamentally well-defined and inherently superior to differing conceptions of God.
Friedrich Schelling coined the term henotheism, from heis which literally means "single, one". The term refers to a form of theism focused on a single god. Related terms are monolatrism and kathenotheism. The latter term is an extension of "henotheism", from καθ' ἕνα θεόν (kath' hena theon) — "one god at a time". Henotheism refers to a pluralistic theology wherein different deities are viewed to be of a unitary, equivalent divine essence. Another term related to henotheism is "equitheism", referring to the belief that all gods are equal. Further, the term henotheism does not exclude monism, nondualism or dualism.
Henotheism has become a less used term, and was later replaced with monolatry where a single god is central, but the existence or the position of other gods is not denied. A henotheist may worship a single god from a pantheon of deities, depending on his or her choice, while accepting other deities and concepts of god. Henotheism and inclusive monotheism are terms that refer to a middle position between unlimited polytheism and exclusive monotheism.