The typical anti-gay argument you hear is, "homosexuality is a choice, therefore it's wrong." But, there's an obvious logical misstep here. Christianity, by definition, MUST BE A CHOICE. But, Christianity isn't "wrong" despite being a choice, so why is homosexuality?
This is where you get people trying to expand & say that homosexuality is a "lifestyle" choice, & therefore it's wrong, but we hit the same logical wall. Christianity is nothing if not a lifestyle, therefore being Christian is also a lifestyle choice & must therefore be "wrong."
Christians obviously do NOT think lifestyle choices are "wrong," otherwise they wouldn't've chosen to make a lifestyle choice and pursue a Christian lifestyle. So what is the real kernel of the homosexuality-as-choice argument?
If you really look at it, really, REALLY examine the homosexuality-as-choice idea, the argument must actually SUPPORT homosexuality.
Because Christianity is a lifestyle which you can only enter by choosing to do so (read up on baptism ;P), then organized religion is a lifestyle choice. This actually sets a wonderful legal precedent for homosexuality, as any "lifestyle choice" must also benefit from the same protections Christians receive.