Pliny the Elder, Natural History 2.5 16–18
“This is the reason it is possible to estimate a greater number of divinities than there are humans: individuals make a number of gods equal to their number by adopting their own Junos and Genii. Indeed, some peoples have animals, even horrible ones, for gods and many others too shameful to report, such as swearing by rotten food or other similar things.
Believing in marriage among the gods but without anyone being born from them for such a great span of time or that some are always old and graying while others are eternally young even children, or that some gods are dark-colored, winged, crippled born from eggs, or dying and living on alternating days, these beliefs are like childhood delusions. But it is beyond every kind of shame to imagine adultery among them, then strife and hatred, and that there are powers of thieves and criminals. “God” is a person helping another person; this is the path to eternal fame.”
quamobrem maior caelitum populus etiam quam hominum intellegi potest, cum singuli quoque ex semetipsis totidem deos faciant Iunones Geniosque adoptando sibi, gentes vero quaedam animalia et aliqua etiam obscena pro dis habeant ac multa dictu magis pudenda, per fetidos cibos et alia similia iurantes. matrimonia quidem inter deos credi tantoque aevo ex eis neminem nasci, et alios esse grandaevos semper canosque, alios iuvenes atque pueros, atricolores, aligeros, claudos, ovo editos et alternis diebus viventes morientesque, puerilium prope deliramentorum est; sed super omnem inpudentiam adulteria inter ipsos fingi, mox iurgia et odia, atque etiam furtorum esse et scelerum numina. deus est mortali iuvare mortalem, et haec ad aeternam gloriam via.