Coming Out: Is it important?

So I know one of the big topics these days is Homosexuality. What with countries around the world starting to legalise gay marriage, it's a topic that's constantly on people's minds. I have a few friends that identify as gay or lesbian and I think it's great that they're able to be so confident and not ashamed of who they are. 
But it also makes me think of people who aren't "out". I wonder because I'm one of them. I've recently (in the last couple of years) realised that I'm bi-sexual. And while I'm comfortable knowing this about myself and have been comfortable telling a few close friends, I'm not so comfortable telling family. 
I've grown up in a Baptist Christian family and my parents have very strong opinions of the LGBT community. Although they claim they have friends in the LGBT community but I fail to see how they could when they have such strong opinions against homosexuality. Every time something comes up on the news especially with the whole equal rights for marriage debate, I just want to blurt out that I have the opinions I have because I'm Bi but I know my parents would think one of two things:
Either they'd think I was just trying to get attention,
or they'd try to talk me out of it.
I don't know what would be worse.....


I've only ever had a boyfriend so I've never exactly experienced what it would be like to be with a girl but I know my family would never understand. My boyfriend and I have been interested to try a threesome with another girl but as he lives with his parents we haven't been able to yet. Which leads me to another thing. I definitely want to have a threesome with my Boyfriend and another girl but I have two things I worry about. One is that I'll get jealous and possessive, something I don't ever want to be. And the other is that I'll end up liking the other girl more than my Boyfriend. I'm slightly worried that if I experiment with a girl even with my boyfriend around that I'll enjoy it to a point where I never want to do things with my boyfriend again. Since I don't actually have any experience with girls I don't know what to expect.....
Maybe time will tell 
As for coming out to my family part of me thinks it would be easier if they knew but on the other hand they seem better off not knowing.....