This is the problem of people who call the Bible a book of fables. They even tell Christian adults that they're getting too old for fairy tales while they hypocritically get entertained by works of fiction. If the Bible is just a fairy tale book then why is it that they put it in their most hated list? True works of fiction can make anyone go furious if it's a reflection of them but the Bible targets man's sinfulness than any work of fiction. You can hate a nonexistent character and be glad that the person doesn't exist in real life but that hatred may exist because that non-existent character may remind you of someone you have a feud with. The atheist's case with their hatred for God is much different. It's all about that they wish God didn't exist.