If he doesn't like it being part of the household and he runs the household, keep the calendar you need in your room if it keeps the peace. If he was just being ornery or careless, forgive him and replace it as you suggest, with a better one.
As a Christian, not sure what you mean when you have a "Christian" calendar. Most Julian calendars likely include 'Christian' holidays along with legal ones, etc. Doesn't make them Christian. I use Jewish calendars when needed.