At what time in history was the "entire world" Christian?

by BanannaMoon

In taking a "Understanding Science and Technology" class, we've talked at length about how religion, specifically Christianity and Catholicism, has shaped the world and science and how people like Francis Bacon, Issac Newton, and Charles Darwin, (in his case, for some of his life,) were all strong Christians, (each of their own branches,) in their lives, and study, having a religious motivation in the questions they asked and things they said. (Minus Darwin, who couldn't accept that a intelligent God would make a world of such chaos and torture for his people to live in.) At what point in history was "everyone" part of the church? The Great Schism is obviously a turning point, so is Martin Luther, but what about earlier? What's the latest point in history where, literally, EVERYONE was religious in some form?

CommodoreCoCo

Could you clarify your question here? You seem to flip-flop on what exactly you're asking. Are you asking about everyone being Christian, as your title says, or being "religious in some form," as your last sentence says?