I don't believe in the concept of sin---which is actually a harder way to live. I don't get relieved that 'my sins are fogiven', washed clean, undone. If I believed in such things, and if I believed in sin, I may actually have peace being a sinner, cuz sinners are forgiven.
Instead I have to consider my actions more carefully. I don't have a fallback. I have actions, consequences and my conscience to deal with I have to clean up my own messes and make peace with any that I have hurt. I have to do this myself, and I don't have the luxury of leaving it in someone else's hands.
You won't get much agreement when you accuse others of sinning. I think you're giving them the easy way out. For me, they have acted in a way to seriously hurt others, and until they try to clean that up, they don't get a pass.
On the upside, if I do something that hurts no one, and someone else thinks I have 'sinned' and offended their god, I really don't have to worry about all that. So in that way, it's a much easier way to live. Easier on myself, and easier on those around me. I am not so wrapped up in how an invisible person evaluates all I do. I can actually just deal with the people I am relating to---and they tend to be quite forgiving.
NC