today in my history class the teacher and another student were discussing religion and he said to her that she must hate gays because she's christian and she said:
"i don't hate gay people, i have no problem with them. it's not right for me, no, but if they choose to be like that, that's fine. as long as it isn't flaunted in front of me."
i was so tempted to join the argument and tell her it's not a choice...
if you ever do, you might also mention her use of the word 'flaunt' when almost every ad, every show, movie, everything is almost 100% geared towards heterosexuality, and the abundant practice thereof.
or you could go the Dan Savage route and tell her that if she really thinks it's a choice, she can prove it by choosing to have sex with you. 
#@!
dude... you just made my day. lol.
Funnily enough, i just spent the last week on a Christian/ study camp, and had fun debating with a couple of camp leaders on issues of homosexuality and differences in world views in general... they didn't manage to sway me, it even strengthened my own perspective.
no offence intended to anyone here who is Christian - i went on the camp to study, and the debates were unavoidable, and i'm not the kind of person to bow to peer pressure. so i stuck up for my opinions, in a manner that was as respectful to their views as i could manage.