I hope to eventually get more of an understanding around Epicurus' ideas/beliefs about the gods. In the meantime I found this interesting article on impiety, but lots of Greek words (maybe Don might enjoy decifering) and I have only read first few paragraphs of introduction.
Here is an excerpt:
QuoteImpiety is an offence, an ἀδικία – i.e., to put it crudely, a wrong that you might do and that is likely to be punished in some way.6 Imperative formulations used in preventive laws, such as ἀσεβὴς ἔστω, ἀσεβείτω and ἔνοχος ἔστω ἀσεβείᾳ, categorize a given ἀδικία as an impiety, but also imply that from now on the culprit will be regarded as impious, and this status will legitimize the application of sanctions from other members of the community. In other words, ἀσεβὴς ἔστω, “let him be impious”, should be understood as a shorter version of “let him be punished as one who is regarded as impious”.7 Far from being a simple linguistic twist, the connection between committing an ἀσέβεια and being ἀσεβής has not insignificant consequences for how we should understand impiety and its implications in Greek society, as well as the Greek legal system in general.
My idea right now is this: that it would not detract from my respect for Epicurus even if he was "not honest" in his piety -- and here is why: because the lying does not cause any harm or pain to any other person. But is seems we can't ever know whether he was "honest" or "dishonest".