I get where you're coming from. All life is a story, but whose story is it? Each of us has our own personal story, our life story, but the grand story, the macro story, is the story going on inside God's head. When I say that, I don't mean in some New Age-y metaphysical sense. That story involves Jesus Christ as a historical person who came to redeem humanity.
Cultures have stories too. They're called myths. Vishnu is a myth, a story that a particular culture has told throughout its history to help it make sense of the world. C.S. Lewis called Christianity a myth with truth in it. That pretty much sums up my own belief, as well.