I guess I'm part of the third group that Rita mentioned. As for the "don't force your beliefs on society", I have mixed feelings about that. For one thing, I do not believe that minors have the right to make most choices on their own, since they are not old/wise/responsible enough to decide many things for themselves. Minors cannot marry, drink, enlist, or be held liable for contracts they've signed unless their parents agree. They cannot have sex with someone much older than themselves. They cannot decide how many hours they will work, or whether they have to go to school or not. So, keep in mind I am talking about adults (whatever that is defined as - that's another kettle of fish! <grin>)
On the one hand, I don't think anyone should be forced by the government or by another grown-up (husband, boss, whatever) to attend any particular church or a church at all, if they choose not to. This, as I see it, is what the separation of church and state really means: freedom of religion, not freedom from religion.
On the other hand, of course we force our beliefs on society! A murderer believes that his needs and desires are more important than the value of a human life and that it's permissible to take a life, in order to get what he wants (money, freedom from annoyance, removal as an obstacle.) I disagree. So does society. So does the Bible, what I consider the Word of God, which is where my disagreement comes from. God sets the value of a human life and the conditions under which it can be taken, and personal convenience isn't one of them. And if someone comes along and takes issue with me trying to stop him from taking a life, too bad. Even if society someday says murder is Ok (and no, I'm not gettin into the abortion issue, thanks, not now), it's not. It is wrong. That is a Truth, capital T.
Rapists believe that they can use sex to overpower another human being, against that person's will, based on nebulous things like "She was asking for it", "I couldn't help it!" "Look how she's dressed or where she was walking!" and so on. I disagree. So does society. So does God. So, if someone comes along and attacks your sister or your neighbor and then says, "Don't force your beliefs on me, I think I ought to be allowed to have sex with anyone who catches my fancy, regardless of what you think or they think", what do you say? "Oh, well, sure, go ahead, far be it from me to force my beliefs on you..." I doubt it.
A child molester believes that a child is a legitimate sexual partner. I disagree. So does society. So does God.
The problem comes in when society thinks something is OK or that it doesn't affect society, so it's no one's business (adultery, for example), and God says it's not OK. Do I think adultery ought to be against the law? Yeah, I actually do, although I'm not going to lobby for laws against it. That's one of many laws that would be pretty hard to enforce! But it does affect society, through the breakdown of the marital bonds and the family, and it's Truth, with a capital T. Do not commit adultery.
So, when someone says she doesn't believe religion ought to affect a society's laws, I say, where do you think moral law comes from? Either there's an objective standard of right and wrong that stands outside of mankind's wishes and desires and societal fashions - in which case it is, it must be, the root of all law - or there is not, in which case no one has a right to tell anyone else anything about what is right or wrong, and everyone's rights will only be what they can grab and hold at the end of a fist.
And if you agree that there is an objective standard, where did it come from?
(Eldragon, I'm so sorry for your friend's pain, and your own grief. How awful to have someone who should have loved and cared for her treat her so.)