Cool story bro. Unfortunately, if you're as young as you seem, I'm going to have to side with the parents. Of course, they sound pretty stupid, but they have good intentions and I assume you won't always be under their control. Also, you FIGHT the Devil Walker. If we don't teach our children to fight the Devil, then he's going to steal their souls and force them not to throw stones at gay people or something like that. Try going with that angle, and draw support from all those fighting guys in the Old testament. Hell, Moses supposedly drowned hundreds of people, right after God killed all their firstborn sons. But since they were the bad guys, it was okay.