Have you ever encountered people who do not know Sin. Last week I interact with two. I got surprised and I prayed God tell me what is this. And God revealed me that: -

     They do not know Sin because the living of this world is Sinful. They presume that what everyone doing (Adultery, Smoking, Drinking etc) is not Sin. 

      God told me to ask them that if you do not know the Sin what you will teach to your children.