Of course, people do not want to believe that some of the things they do are sin. The person who drinks alcoholic beverages does not want to believe that he is sinning, and the companies that manufacture alcoholic beverages do not want people thinking that using their product is sin. People who gamble do not want to think of their gambling as sin.
People who are proud do not want to think of their pride as sin. The adulterer, the murderer, the thief, the homosexual, the gossip, the liar, none of these wants to admit that these things are sin. But God says they are.
All have sinned and fall short of the glory of God. (Romans 3:23)
If a person admits that he has sin in his life, that he is a sinner, then he feels the need for some kind of salvation from the penalty for that sin. Most of the world's religions are driven