TO CHOOSE

Following up on my previous posting, some people believe that homosexuality is unnatural and therefore is a choice.
Putting aside the notion that someone would choose to be of a group that was persecuted because of it's main reason.
Putting aside the notion that even if it is a choice it still should be protected under the laws of fairness.
Suppose is it. I don't know. I am of the theory that everything is genetic, we are mostly products of nature, but nurture, our upbringing, can either encourage or temper this,* or we can learn the ability to mimic and fake a certain behaviour to fit in.
But suppose being a LGBT person is a straight choice, writing the pros and cons or just to rebel or annoy your parents or whoever? Do you know what else is a straight choice? So much so that it's proponents loudly and proudly declare it, that no one can be born this way, they have to actively make the decision to become one?
Christianity.
That's all. . .

*The best (only) example I can think of is someone genetically predispositioned to lung cancer growing up in houseful of smokers and being encouraged to take it up themselves.