Second:There's a chance that you are right about this hypothetical sin by your child, but please remember if that ever happens to you or a friend or relative that there's also the chance that the child's genetics -- beyond his control -- is at work, not something selected as one would choose a wardrobe, a favorite restaurant, of a favorite sports team.
I have already acknowledged that it is genetics. Since Adam, genetics has ensured that we all inherit a sin nature, and the choice as to what we struggle with is not always up to us and is often beyond our ability to shake them. That's what Christ (the second Adam) died for. To redeem fallen men and women, whether they be homosexual, idolators, fornicators, liars, God haters, and a whole lot more things that Paul listed out in several of his episitles. A discussion such as this always takes me back to one of Christ's teachings http://bible1.crosswalk.com/OnlineSt...=1&showtools=1
It is always real easy to look at a sinful lifestyle that we have no desire to engage in and wag our fingers, but we must all repent of our sins, whatever those may be, or we shall all likewise perish.