Justin Martyr, First Apology 6
From this we are also called atheists. We confess that we are atheists with regard to the gods that people consider real, but not with regard to the truest God, the Father of justice, self-control, and the other virtues, a God completely unmingled with evil. We reverence and worship that God, and the Son who came from Him and taught us these things, and the army of good angels who follow and are assimilated to them, and the prophetic Spirit. We honor them with reason and truth, and we generously impart what we have learned to anyone who wishes to learn it.
Greek
Ἔνθεν δὲ καὶ ἄθεοι κεκλήμεθα· καὶ ὁμολογοῦμεν τῶν τοιούτων νομιζομένων θεῶν ἄθεοι εἶναι, ἀλλ᾿ οὐχὶ τοῦ ἀληθεστάτου καὶ πατρὸς δικαιοσύνης καὶ σωφροσύνης καὶ τῶν ἄλλων ἀρετῶν ἀνεπιμίκτου τε κακίας θεοῦ· ἀλλ᾿ ἐκεῖνόν τε καὶ παρ᾿ αὐτοῦ υἱὸν ἐλθόντα καὶ διδάξαντα ἡμᾶς ταῦτα, καὶ τὸν τῶν ἄλλων ἑπομένων καὶ ἐξομοιουμένων ἀγαθῶν ἀγγέλων στρατόν, πνεῦμά τε τὸ προφητικὸν σεβόμεθα καὶ προσκυνοῦμεν, λόγῳ καὶ ἀληθείᾳ τιμῶντες, καὶ παντὶ βουλομένῳ μαθεῖν, ὡς ἐδιδάχθημεν, ἀφθόνως παραδιδόντες.