Many atheists, antitheists and agnostics underestimate the affect that Christianity has had on society.
We changed the way we count time to begin at the year of Jesus' birth.
We take part in practices that the Bible outlined thousands of years ago.
We value unused power; a sheathed sword, as the "meek" in "The meek shall inherit" translates to.
Marriage is a religious ceremony, hence why couples go to a church to get married.