Sin generates disjunctive emotions of guilt and shame which further contribute to Disconnection. The guilt and shame of disjuncture are painful and an organism will do anything necessary to alleviate that pain. This may include employing Defense Mechanims to repress Self (Self Suppression) and engaging in Self Stupification by using substances like Heroin, Cocaine, or alcohol which dull awareness. Note, Self Suppression may contribute to the development of depression, neurosis, psychosis, and even physical disease.
Sin is a loaded term, but it’s also a common term, and a useful term if you understand a) that sin is a disjunctive act that harms another being and b) that the “sin” isn’t against God, it is against your own Highest Self. When you sin, you are engaged in an act that is so repulsive and disjunctive to your Highest Self, and consequently so disconnecting, that it deserves its own special word.
You can harm another living being and still not be in sin. For example, it is not a sin to defend yourself or your family or feed your spouse and your kids. Neither it is a sin to eat meat when vegetarianism/veganism is not a viable option.
Sosteric, Mike and Ratkovic, Gina (2019,BOOK2). Lightning Path Workbook Two: Healing. Lightning Path Press. 
Sharp, Michael (BOOK3). Lightning Path Workbook Three: Connection. Lightning Path Press.