you can't blame the brainwashers if they too have been brainwashed
Religion is a choice. I changed my decision a few years ago. If you're teaching your kids that liking a different gender is an attrocity, you're just as at fault as the people who taught you that, because you can always realize you're wrong.
I wouldn't blame the kid though, he's probably too young to think independently. The threshold here I would put at 16 to 18.