Senthil, What do you mean by Ramayana is a story book? If this is story book then so are fantasy fables like bible and quran. I guess you have a limited understanding of what religious scriptures are. Hey come to think of it each and every thing is a story waiting to be told. So use discretion while making such statements. If you look at it the biggest fantasy tale is bible and that too not by "substance" but "audience".