Should I tell my close friend about my sexuality?

I'm a girl, and I just happen to be bisexual. However, I recently found out about one of my closest friends being against gay people. She thinks a person's sexuality is the person's choice, because she's a recent Christian. Back when we were in grade school, she asked me about my sexuality. Told her I was straight, just to seem "normal". Now that I'm old enough and mature enough to reject the typical mindset of a number of people around here (I live in Asia...), I'm not comfortable with the idea of perpetuating a lie. Yesterday, I asked her how she would react if I told her I were a complete and utter lesbian (she reminded me of her question in grade school.). She said: "I would regret being close friends with you."

So, I shrugged it off and told her I was not, seeing as I'm bisexual. I hate how I can never be comfortable to be myself around her, due to the fear of being judged. Should I be honest and tell her to sod off if she cannot accept me the way I am, or should I continue shrugging it off? I am just a bit dubious about losing someone I've known for so long because of my sexuality. I'm also a bit disgusted by her attitude, to be frank.

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