The Worst Sin You Can Commit Not all sins are equal. Some are worse than others. The worst one of all? Committing evil in the name of God. This commandment is often misunderstood because it's mistranslated. It's not concerned with saying God's name "in vain" like "God, did I have a terrible day at the office!" It's about using God's name in the commission of evil. We see this today when Islamists invoke God's name while they murder innocent people.