spirits have to be let in... i assume you understand this. otherwise everything would have been completely fucked up from the get go. they must obey free will, this whole world couldn't exist without that as a fundamental principle, it would just be demon planet. it follows then that the enemy you're up against is really the child, not the demon. weird as that sounds. as to your quest of trying to enlighten people about malevolent spirits... just... nah. good luck to you, but in my experience that doesn't work.
Norway