Why Is Christianity Conservative?

"Christianity tells us that it has the one correct worldview. This argument fails because Christianity is a fragmented battlefield with no unanimity on any social issue and because Christianity has never dragged a reluctant society into a new understanding on a social issue that is later accepted as correct. If it were the one correct religion, as it claims, it would be leading the charge on every social issue."

Why does the church make no moral commands that we moderns find shockingly advanced?