If the bible is book that is littered with stories that are pure fiction but that are conveyed in such a way to appear as legitimate
I always consider this question a rather strange thing for a Christian to ask. I could understand the question if asked from a Jewish perspective, but I don't find it a logical question from a born again Christian. I would expect that one Christian would completely understand how another Christian came to accept Christ. And very little of that experience has anything to do with Adam, Noah, Moses, David, or Sampson's escapades.
The stories in the Bible are conveyed as legitimate because the people writing the stories believed them to be true. However the further back into history the stories are set, the more disconnected are the events from the authors.
And how many of those events are essentially to Christianity anyway?
Under a government which imprisons any unjustly, the true place for a just man is also in prison. Thoreau: Civil Disobedience (1846)
The apathy of the people is enough to make every statue leap from its pedestal and hasten the resurrection of the dead. William Lloyd Garrison