Found this interesting fragment...that the rituals to the gods were not followed at Epicurus' Symposium:
QuoteAthenaeus, Deipnosophists, V p, 179B: Again, Homer tells us what we are to do before we begin to eat, namely, we are to offer as first-fruits some of the food to the gods. ... Homer also shows us the feaster at least offering libations ... all of which Plato also retains in his symposium. But with Epicurus there is no libation, no preliminary offering to the gods; on the contrary, it is like what Simonides says of the lawless woman: "Oftentimes she eats up the offerings before they are consecrated."