Why are Bothered about why Lord Shiv cut of His sons head? If your are so intrested Pray to him may with his grace you will get the Knowledge or just search the web.
We are not hear to Preach our Religion Like you intend to withour any one remotly keen doing any thing with Islam and its Evil Preachings
If you what to preach your religion, Please look for another foram! Fearing your own god is no way to lead a life my friend , One with true Respect and Devotion will you be able to connect with your god not with Fear! Fear will not forgive you! We will fear no Alla and his evil terrorists since we know he uses fear to propergate his religion and subdue his people!