Those who believe in sin have the most sins. From a Christian perspective: Jesus washed away all sins from the beginning to the end of time of all his believers. If they were washed away, then there is no sin left and the person that continues to judge himself/herself as a sinner is sinning by thinking so, which is akin to saying that Jesus did not accomplish what he is believed to accomplish. "washing away the sins of the world"
For the rest of us, sin is a ridiculous idea and we know that it does not exist.