Aside from the famous "What will this babbler say?" in regard to Paul of Tarsus, which was said by an Epicurean or possibly a Stoic, there are few if any texts representing the views of an ancient Epicurean on the early Christians. The only example other than Acts 17:18 which known to me is the commentary of Lucian (who was Epicurean either in reality or in spirit) in his "Death of Peregrine":
"It was now that he came across the priests and scribes of the Christians, in Palestine, and picked up their queer creed. I can tell you, he pretty soon convinced them of his superiority; prophet, elder, ruler of the Synagogue--he was everything at once; expounded their books, commented on them, wrote books himself. They took him for a God, accepted his laws, and declared him their president. The Christians, you know, worship a man to this day,--the distinguished personage who introduced their novel rites, and was crucified on that account. Well, the end of it was that Proteus was arrested and thrown into prison. This was the very thing to lend an air to his favourite arts of clap-trap and wonder-working; he was now a made man. The Christians took it all very seriously: he was no sooner in prison, than they began trying every means to get him out again,--but without success. Everything else that could be done for him they most devoutly did. They thought of nothing else.
Orphans and ancient widows might be seen hanging about the prison from break of day. Their officials bribed the gaolers to let them sleep inside with him. Elegant dinners were conveyed in; their sacred writings were read; and our old friend Peregrine (as he was still called in those days) became for them "the modern Socrates." In some of the Asiatic cities, too, the Christian communities put themselves to the expense of sending deputations, with offers of sympathy, assistance,and legal advice. The activity of these people, in dealing with any matter that affects their community, is something extraordinary; they spare no trouble, no expense.
Peregrine, all this time, was making quite an income on the strength of his bondage; money came pouring in. You see, these misguided creatures start with the general conviction that they are immortal for all time, which explains the contempt of death and voluntary self-devotion which are so common among them; and then it was impressed on them by their original lawgiver that they are all brothers, from the moment that they are converted, and deny the gods of Greece, and worship the crucified sage, and live after his laws. All this they take quite on trust, with the result that they despise all worldly goods alike, regarding them merely as common property. Now an adroit, unscrupulous fellow, who has seen the world, has only to get among these simple souls, and his fortune is pretty soon made; he plays with them."
If anyone knows of other ancient examples, please post them.