My girlfriend and I had a discussion about the worst sin someone could make. I thought it was murder, but she said it says clearly in the bible what the worst sin is. I disagree with her. It seems murdering someone would be the worst sin of all. she pointed to scripture that she says justifies her opinion, but I am not sure if what she says is really true. I want to see what people say is the worst sin to commit and see if that is the same answer she gave me. So what is the worst sin of them all?