Tell us a bit more about your parents. Are they conservative/evangelical Christians who are likely to react badly, or more liberal? It's not that they are Christians, it's what sort of Christians they are that is the big issue here.
Sorry I can't help you out much except agree with Linco that you should elaborate but I've gotta say that I love your avatar! Kawaii!
Hmmmm, I know that i have trans tendencies soo.... I'd tell them why you are this way, that god made you who you are, Use the bible to your advantage and we need more info on your parents. Use knowledge for persuasion
Sorry guys, I lost my password for this account and created a new one I posted a better version of this thread on there it is AgnisFlame