I would like to pose a few questions. Why do you believe that Harry Potter has seen so much success? Why do you think that so many television shows are now focusing on "supernatural" experiences? Ex, "supernatural," "The Ghost Whisperer," "Medium," "Heroes," etc. And look at the movie industry...
I'll offer up a thought to consider. Miracles are dead.
Okay, now before you go off on a tangent telling me about the person you know who was miraculously healed from cancer, I don't actually think that miracles are dead, per say, but the world has changed since Old Testament days. We no longer have any Samsons. We no longer have a Moses or Elijah or Gideon or fiery furnace trio. We don't have a man feeding thousands with a couple fish and a few loaves of bread. Simply put, we haven't had a global miracle in so long that the world is hungry for one. (Personally, I think this is one of the reasons the Anti-Christ will gain so much power and convince so many people that he's the real deal, but that's another discussion.)
So, in the absence of miracles, what would any average miracle-hungry person do? Go looking for one. I write supernatural thrillers/horror and I got to thinking about the reasons that so many people love these genres. In research for a WIP, I've been going back through and re-reading a lot of the OT miracle stories when it hit me: We just don't get to see this kind of stuff any more. Sure, we have our tiny miracles...People saved from accidents that should have resulted in certain death, people cured of terminal illnesses in the blink of an eye, people without a dime to their names living without care day after day on faith...But where is the grandiose "Hand of God" miracle these days?
Ghosts. Ouija boards. Haunted houses. Psychics. Voodoo. Mediums. They offer up little miracles for the people that let them... But why do people let them? Because we hunger for more than what this world can show. Deep down inside, our very souls KNOW the supernatural exists. God is supernatural. And knowing that, knowing the infinity of his power, spurs the imagination, stirs that ingrained part of our souls that hungers for Him.
But not everyone knows Him. Not knowing Him doesn't stop the hunger, it doesn't stop that spiritual need for proof that something greater than our lives exist. And when someone doesn't know Him, all of the other supernatural things become so much more attractive. We want to explain the things we can't explain. We want to hope that there is some kind of life after death. We want to believe that our time on this earth isn't futile. And if we don't have faith in God, in Heaven, what do we have left as options? Reincarnation? Some kind of spirit world? etc.
Now, for those of us who do know Him, who have faith in the here-after, the supernatural isn't as much of a mystery. It's a fact. We know that God isn't the only one who moves in this world. The devil's agents move as well. So, as a Christian who loves supernatural thrills, I've come to see the importance of showing this modern world in which we live in proper light. I think we need to remind everyone that miracles are in fact, alive and well. They might not shake the world's foundation when they happen, but they happen according to His plan. And more importantly, we need to shed Light on those "miracles" that don't come from His throne so that those people who don't know Him can see a glimmer of truth through all the lies.