God didn't give Adam and Eve the right to decide what was good and evil. He gave them the right to choose between good and evil.
Giving God permission to make you a saint will ruin your life.
I'm a sinner. I don't always love God as strongly as I could or as directly as I should. Ash Wednesday reminds me that it is only through God that I have life; He gave it to me. God forgives. He loves. And He gives this sinner a second chance. Put simply: my God kicks ash.