Fine. If you would look at your child, that you have raised and loved since the beginning of their life, through all their tears and laughter and 'cast them out' because they're gay, that would be between you and your conscience. If I had to make that decision, I certainly know what my reaction would be...
I know that. I just don't believe you should kid yourself into thinking it's the right one.
You should stop kidding yourself into thinking your hypothetical is parallel to your kid being a goth or somesuch. The parallel is your kid being a child molester, or a beatialist. It's just that you are a product of a society that has had most of its sensitivities dulled through forced familiarization.
Note how many on your side of this argument are not interested in discussing the matter. They don't have Scriptural support for their position so their entire argument is a variation on what's wrong with the people who don't agree with them.