Come Out of Babylon

A lot of Christians think they are saved, or they think that they are doing the right thing. Some don't think they need to do much to be saved. Some will act like a Christian when at a Church service, but then be very worldly away from Church. Some love this world so much, that they cannot bear to come out of it. But God does tell His people to come out of Babylon. What does that mean? Who needs to come out of Babylon? What does it mean for you?