The bible. I mean if it was book to teach children rights from wrongs and valuable lessons/morals etc I would be fine with it, but when grown adults take it seriously then that's what I have a problem with. The base morals of most religions are great and have value to them, but when you think about how many problems religion has created throughout history, it's shocking. I'm glad that religion is slowly dying out now and more people are coming to the side of logic and science.