What is sin? and how do we define it? A century and a half ago, if a woman went out in public with her ankles exposed, it was considered to be a sin. Now women go to church wearing mini-skirts and no one thinks twice about it. If you say "The bible defines sin" which parts do we follow, and which do we ignore? The OT is full of odd rules that modern Christians ignore. Like...you're not supposed to wear clothing made from two different fabrics, or you're not supposed to cut the sides of your hair or beard, or not supposed to mix an animal's milk with it's meat (No cheeseburger for you!) . There are many others. "Sin" seems to be what the current generation thinks it is.