Here's my struggle I am trying to figure out. IF I don't believe in anything supernatural, should I encourage my kids to believe in something supernatural? Should I still celebrate things that are supernatural?
Back at Alchemist. Yo aren't speaking for me. I don't celebrate those things. And I don't believe anything is possible. Of course, that would be a subjective opinion. Something could arise totally unexpected and you could say, thought that was impossible?
Why would you "encourage" them to believe in something you don't think is valid?
I think what you encourage them to do is develop their own views, using critical thinking. Encourage them to explore. Do not try to control their thinking; what you're after is free thinkers, right?
One thing parents sometimes misunderstand is that kids often ask hypotheticals in a sort of overdetermined way that we tend to over-react to. For example, "what is heaven like?" doesn't usually indicate that they've already decided that heaven is real ... they are just imagining that it is, it's a thought experiment. So rather than over-react and blubber about how heaven isn't real, I would answer it with, "well, different religions believe very different things about afterlives. In our country, the Christian view is most common, and a lot of Christians think X, Y and Z. Of course, a lot of people don't think there's an afterlife at all. What do you think? Why?"
This answers their questions but not in some didactic way, it presents heaven for just what it is -- stuff that people think -- and points out that many people think contradictory things, and some do not buy it anyway. All without getting defensive.
Theists will probably try to tell you that you're depriving your children of something important -- or at least, of comforting beliefs. But theists are depriving THEIR children of something far more important than comforting lies. They are depriving them of free inquiry and exploration. And you're not.
Why would you want to fill up their heads with BS? Nature is indinitely variable and fascinating. Belief in things supernatural is like putting on a blindfold. You can't see nature if you are focussed on something beyond nature that does not even exist.