Honestly as an 8 year old from an atheist family who only believed for a couple of months whilst going to a Christian school that was enough.
Now as an adult basically the whole she-bang. From the beginning where humanity is created through a couple who breed and then go along incestuously for generations without consequence, to people living for hundreds of years before modern medicine to dragons and demons, to people being cursed by being given black skin, to a virgin birth and then the end of the world where there is a pretty corny war between good and evil and in this situation the genocidal maniac who butchered millions of children is supposed to be the good guy.
That's before you get to the whole political side of the it, from both how it was compiled, by a Roman Emperor desperate to remain in control of a growing Christian population suddenly converts and then appoints a group of bishops to decide which books should be part of the bible and which books should not. To the whole malleability where they'll move the birthday of their messiah to cater to the Germanic pagan tradition of celebrating pine trees. Then you get the whole totalitarian metaphor of being thrown out of an idyllic paradise for daring to eat from "The Tree of Knowledge" which has a real North Korea vibe, this is repeated again with the Tower of Babel.
Then there's also the fact that most of it has been scientifically disproven.
Its interesting to hear your point of view.
