I'm perplexed by what I'm seeing.  The point of our fight isn't and has never been to convince the christian right that we can never be changed.  If you've been believing this, then you've been mislead.  We want to have our choice, not their choice.  We want people to know that human sexuality, regardless of which way they're leaning, is morally neutral.  We want christian fundamentalists to butt out and stay out of our sex lives.  
Think of what you're saying.  On the one hand, I have christian fundies telling me I have to change to being straight.  On the other hand, I have you telling me I absolutely cannot change.  You both are just 2 sides of the same coin.  You both want to take my choice away from me.
Let me repeat.  Human sexuality is morally neutral.  It's like taking a walk in the park.  Not everything has to be morally right or wrong.  Wanting to stay gay or to change is also morally neutral.  It's the pushing, the taking advantage of people's religious belief, the manipulation to change people's sexuality that we should be fighting against.
Also, let me repeat.  I don't know if I can change.  I have not tried.  At this point in my life, I've no inclination to change.  I'm much too happy with my boyfriend to change.  That said, if some point in the future I decide to want to change, there ought to be nothing wrong with that.  What part of giving people free choice don't you understand?