The word "slavery" has incredible baggage attached to it.  Anyone living in the United States with even a general knowledge of history feels discomfort talking about it.  It's important to note that while slavery was thought of differently in New Testament times for a variety, no one (then or now) truly wanted to be a slave of any kind to anyone.  And yet, in Romans 6:14-23, Paul presents his audience with a choice: be a slave to sin or a slave to God.  This is a choice that we all face.  We are either one or the other.  What makes the difference?  Paul tells us: in Christ we are free to make the choice to be slaves to God and therefore slaves to righteousness.