I don't think any of it is reliable. I could invent something based on any Scripture in the Old Testament, fill in the gaps with complete fiction, and then publish a book on it. If I fraudulently label the book as fact, and it is good enough as a story, pretty soon people are going to believe it. And it will eventually get legend status, at which point people will believe it as fact. Hey, the Washtowel attempted that last summer with their drama--too bad it was so poorly executed that no one is going to believe it.
What is wrong is when they plagiarize it and take it as their own. If the work is on the public domain, they are allowed to use it as their own without worrying about lawsuits. However, if they are using it as their own work, and then forcing millions of people to stake their lives and salvation on its validity, that is much more serious whether the work is on the public domain or not. If the original was fiction, and they are staking lives on it, people are either going to die because of it or live stagnant lives because of their fraud.
I never did believe in the Genesis fairytale after leaving the Washtowel. All it is is a story that someone made up. If the whole thing is fiction, and someone passed it as truth, it was fraud. Otherwise, it was just a story that was told so many times that people began to believe it. Another Goldilocks and the Three Bears story. They might as well believe in the Flying Spaghetti Monster.