there are no "sins" however there are morals, ethics, and ideology. The worst thing in Satanism is ignorance. Constant study will solve that issue. Obviously horrid atrocities such as animal abuse, child abuse, murder, spouse abuse etc is WRONG. Satanist also are law abiding, there are to many stories of satanist being young adults who go around breaking the law. Over all though just dont be stupid and think for your self.
Heil Satan
no there is no "sin" because there is no deity promising to take your soul and burn it in hell for eternity. What you do in life is on you. morals and ethics, right and wrongs are ultimately up to your discretion.
No. The sooner you stop trying to simplify everything and make Satanism adhere to the idiotic and guilt laden philosophies of the RHP religions the sooner you will see the truth.
In large part the only thing you can do that could even remotely come close to what a sin is, is to oppose Satan and His plans and works, creating infighting and cursing other Satanists falls into this category as well.
Spiritual practice creates conscientious actions, ethical standards and all other things necessary for good civilised and productive life in communities with protection of the vulnerable and exoneration of the innocent so much so that guidelines for behaviour become unnecessary.