If I do bad things and go to hell, I will be tortured for all eternity, for a finite action. that's like a life-sentance for somone eternal. in comparison to infinite punishment, my action was zero.
I'm an atheist/daoist, and I think what is right, or wrong is based on the net happyness, or unhappyness the action creates. if you want to murder someone, then it is wrong, because your unhappyness is outweighed by the unhappyness of the person, and their loved ones.