[@Anima]

It works if your character's parents were Fanatics. The Mordrem appeared twenty years ago, but the Fanatics would probably not have formed in full until a year or two later, so it doesn't leave much room for your character to have developed those values and when he or she began to show signs of spirit possession. But, if the parents were Fanatics, you premise works. I also think that it has more potential for sub-plots and such, not to mention social stigma—your character's parents being Fanatics would probably not sit well with a lot of people.