Strangely enough, there IS an expectation from people that Christians should be DIFFERENT. They should have integrity. They should be honest. They should work hard. They should be loving people. And strangely enough, God seems to think the same thing. In the Bible, this expectation that God's people will be DIFFERENT is called holiness, and in 1 John, we get a picture of what that should look like...because God is light and HIs people should live in the light.