darktina
I personaly think that since you already know they are against different sexualities to keep it to yourself or mabey just your close friends. Though you parents should be the most understanding of anyone sometimes they arnt. So dont tell them because it could ruin your relationship with them.
I see where you're coming from, but I kind of disagree a bit. If it comes up some how, maybe you should try explaining it to them. I tried to come out to my parents, but they denied the existance of bisexuality. I don't you should just not come out to them, but I've got a boyfriend now, so until I get a girlfriend or get serious with a girl, I personally don't feel a need to bring it up again. But don't alienate them completely, I just think that's a bit... I dunno, I guess I think that purposefully alienating them is just as insolent as they're being.