Logic. In short, Jesus didn't walk on water. The red sea was not parted in the exodus. Stuff that is clear myth is myth. Revelation in other cases like genesis 1-2. Order of creation is not important if it were they would of wrote them in the same order. We can probably see actual order of creation in the fossil record.
Sorry to butt in, but if you use logic then you have to throw just about everything if not everything in the book out.
Christianity, One woman's lie about an affair that got seriously out of hand