Well first off, you shouldn't be using all the "fucks" associated with god. I myself am agnostic and find religion interesting, but don't follow a set one with a god. I do have one tip, educate yourself on it before you get into an argument or debate about the subject, otherwise you will look like an idiot. Let your parents know how you feel and tell them that christianity (I'm assuming) is not your bag and you don't wish to live by the religion.