Not hopeless, it obviously works sometimes or we wouldn't be here. But this suggests deconverting young people will work more often, as they will have sunk less time into theism and generally act immortal anyways so knowing God hasn't got an eye out for 'em won't shock as much.
my experience with young adult Christians is that once they get to the stage of caring enough to argue with you, they are a lost cause. Most young don't care either way, and will quickly get bored if you talk to them about such matters
Go see for yourself.
The complete post is quite long and just as good as this quote.