Early Christianity, like Roman-era philosophical traditions, laid emphasis on everyday behavior, about how to live your life.

Galen's observations reflect one of the distinctive features of early Christianity. Roman-era religion was mainly about ritual actions vis-à-vis the gods, and there was little to do with ordering behavior otherwise.

Justin Martyr says that he was impressed in his study of the Old Testament, at the seriousness and contents of these writings, and became convinced that Jesus fulfilled these texts.

Justin's testimony about becoming a Christian is that he had been searching various philosophical traditions of the time, and then accidentally encountered a man who posed questions that pointed Justin [Martyr ] in a new direction.

Early Christianity, like Roman-era philosophical traditions, laid emphasis on everyday behavior, about how to live your life.

Galen recognized, with some considerable puzzlement it seems, that Christians exhibited the virtues that he associated with the discipline of philosophy.

I think Rodney Stark makes a substantial contribution to the study of early Christianity in posing the kinds of questions that he pursues (which reflect his social-science background).