Today's date would be displayed here if Javascript worked on your device. Disengage cloaking device. All sin is evil, and many would agree that some sins are worse than others. In the eyes of most people, stealing a pen from work is not as bad a thing to do as murder or rape.
Some churches teach that there are 'major' sins and 'minor' sins.
I do believe that not all sins carry the same consequences down the road. I do agree that the temptation to list one sin above all others is strong and possibly even scriptural. Whatever the sin is called, it has not changed over the years. In other words, the greatest sin described in the Old Testament will be the same greatest sin described in the New Testament. The Old Testament, as part of the commandments given through Moses.