I haven't read this through but at the very least this article collects references on the topic of Atticus' level of devotion to Epicurean philosophy.
Article - "Was Atticus An Epicurean?" [Gilbert]
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Cassius
March 11, 2020 at 8:00 AM Changed the title of the thread from “Article - "Was Atticus An Epicurean?"” to “Article - "Was Atticus An Epicurean?" [Gilbert]”.