Oh, I just think it's interesting to think about these things! They've obviously played a huge role in the development of our modern societies (at least in the west) and studying the theology is just an interesting and revealing thing to do.
I take your point. It's worth studying these things out of curiosity, but I wouldn't seek guidance from these fables any more than I'd seek Napoleon's advice on air-to-air combat tactics.
Why do we study history? Same reason :)