Isn't it hypocritical to assume that your religion is correct just because your religion's texts say it is? People who follow Christianity claim the bible is true because it SAYS IT IS. Just like any other religion's "holy book" will do the same. Of course they're going to say they're true and everyone else is wrong! Why can't anyone offer rationale from a perspective that is not directly influenced by their own religion?
As an outsider to religions, none of them look any different than the next. Comforting explanations with set regulations to keep people believing them and passing it on to the next generation.