What we commonly have in our mind when we speak of religion is a definite set of doctrines, of a more or less metaphysical character, formulated in a creed and supported by an organization distinct from the state. And the first thing we have to learn about the religion of the Greeks is that it included nothing of the kind. There was no church, there was no creed, there were no articles. Priests there were, but they were merely public officials, appointed to perform certain religious rites. The distinction between cleric and layman, as we know it, did not exist; the distinction between poetry and dogma did not exist; and whatever the religion of the Greeks may have been, one thing at any rate is clear, that it was something very different from all that we are in the habit of associating with the world.

G. Lowes Dickinson (1862-1932) British political scientist and philosopher [Goldsworthy "Goldie" Lowes Dickinson]

The Greek View of Life, ch. 1 “Religion,” sec. 1 (1911)
    (Source)