Christianity is not a religion of do and don't. It is a relationship with Lord Jesus Christ. The loving relationship, a two way relationship, just like a husband and wife as described by Lord Jesus that we are the bride and He is the bridegroom.
By believing only in religion of do and don't, very likely one will fall into sin of "don't ". For isnstand when you are in a theatre, and there were many doors around you, all other doors are the same except for one door which hangs out signs for instance like: "Do Not enter, prohibitted, Beware inside only for 21 years and above, don't go in when you are alone, etc, etc". So, what happen to you when no one but you inside that theatre ? Would you not be curious enough to enter that room ?
Thus, the conciousness of sins will bring out the action of sin itself.