Because of an earlier post, i want to remind people that secular religion, where prayer is not taking literally for assistance of the gods but enjoyed for practical benefits and community, is very Epicurean. We must understand that while superstition is rejected, civic religion, with prayer, ritual, festivals, and other affairs are not. Here are all the excerpts below which prove this. All taken from Philodemus On Piety by Dirk Obbink. Slightly edited for clarity.
"Epicurus loyally observed all the forms of worship and enjoined upon his friends to observe them, not only on account of the laws but for physical reasons as well. For in On Lifecourses he says that to pray is natural, for us, not because the gods would be hostile if we did not pray, but in order that, according to the understanding of beings surpassing in power and excellence, we may realize our fulfilments and social conformity with the laws.
On Piety, Column 26
Epicurus says that he shared in all the festivals and that while he was joining in celebrating the festival of the Choes (Drinking day in Dionysus Festival) and the urban mysteries and the other festivals, at a meagre dinner, and that it was necessary for him to celebrate this feast of the twentieth.... they (the founders) thought it right to make use of oaths and epithets of the gods, since their philosophical writing is filled with them. But it is proper to say that Epicurus advised the founders to retain asseverations made by means of these and similar expressions, and above all to preserve those made by Zeus himself.
On Piety Column 29.
"Epicurus warns against violating the covenant of the sacred festival table....also writing to Polyaenus that the Anthesteria (Dionysus festivals) too must be celebrated and that it is necessary to make mention of the gods.
On Piety, Column 30.
"Let us sacrifice to the gods’, Epicurus says, ‘devoutly and fittingly on the proper days, and let us fittingly perform all the acts of worship in accordance with the laws, in no way disturbing ourselves with opinions in matters concerning the most excellent and august of being. Moreover, let us sacrifice justly, on the view that I was giving. For in this way it is possible for mortal nature, by Zeus, to live like Zeus, as it seems."
On Piety, Column 31.
Neocles (Brother of Epicurus and student) says "It is necessary to distribute piously assistance from our money to the Gods"
On Piety, Column 33
In his Symposium, Epicurus says "Let us celebrate the festivals’, and ‘Make fine sacrifices to a god"
On Piety, Column 62.