But while we wait, I found this.
Treatise on the Gods
"One Spring there came great rains in the valley and on their heels a flood of melting snow...One night the flood rolled into the lowermost cave, cut off the occupants, and drowned a mother and her child...The rising water to them seemed like a living thing...One fellow steps boldly forth...He goes close to the edge and bombards his enemy with stones...Growing bolder, he stalks into the water and belabors it with his club...the next morning the flood begins to recede...This first priest could accomplish something that other men were incapable of...What more natural than to give thanks?...True religion was born at that moment...He took on the aloof, philosophical air of a dermatologist contemplating a rash: he learned how to avoid making promises and yet hold the confidence of his customers... He gave some thought to the form and content of his first incantations, and thereby invented the first ritual...The gift of blarney went with the sacerdotal office, in the early days as now...the new trade of priesthood had attractions that were plainly visible to any bright and ambitious young man...When he let it be known that there were certain things, done by the people, that would gratify the gods and insure their aid, these things began to be regarded as virtuous, upright, moral. When he announced that other things were frowned upon, they straightaway became sins...The priest found himself a law-giver...Did the fires rage and the sky remain dry? Then it was because the faithful had forgotten their plain duties...It was not the priest's fault...calamities were plentiful in those days, as they are now. They remain the most potent weapons in the armamentarium of the priest...Theologians, as a class, are practical men. Immortality, as they preach it in the modern world, is but little more than a handy device for giving force and effect to their system of transcendental jurisprudence: what it amounts to is simply a threat that the contumacious will not be able to escape them by dying...I am myself a theologian of considerable gifts, and yet I can no more imagine immortality than I can imagine the Void which existed before matter took form. Neither, I suspect, can the Pope."