I think you may be misunderstanding me. I don't agree with sins of mistakes. That is your view. I don't assume He holds me accountable for my mistakes. Sins are different. You consider them the same so in your understanding you would be held accountable for your mistakes and be doomed to eternal separation from God if you do not repent and forsake such.
If you stub your toe or scrape your knee, you will need to repent of the evil you have done and forsake doing those things again. At least that is how I perceive your point of view here.