Ignore the religious fanatics and little kids. Ouija boards are real (I've seen several), but I only mean the boards themselves are real. All the hysteria around them is just that - hysteria. They really are just a harmless board game, which is exactly what Hasbro says they are, and the only time they are truly dangerous is if you pick one up and use it as a weapon.
But in your case, don't touch the Ouija. It's a bad idea all around, and I'll tell you why.
You mentioned that you're a Christian, and obviously you're a true believer because you also said that stuff is against you. I'm not going to challenge your beliefs, because that stuff is your business and yours alone, and nobody is allowed to take that from you. You're right, dabbling in other beliefs even just for fun is against the rules of the Christian church. You don't make the rules, but you did choose to follow them. And as you know, there is no room for playing picky-choosy with the rules of your faith - it's an all or nothing deal.
If you play with the Ouija, you won't have to deal with any demons or devils or evil spirits. But you'll have to deal with yourself, and that's a problem. You can't exorcize yourself, nor can you hide from yourself. You'll have to answer to yourself for going against your own beliefs, and that can tear a person apart for a long long time. In a way, that's a demon all on its own and it will follow you no matter where you go. You might even have to talk about doing it in confession to clear your conscience. Do you really want to have to admit that you broke that rule to someone, and listen to the disappointment in the minister's voice when you do? Altogether, that stuff might be worse than anything old satan could ever do to you. Are you OK with putting yourself through all that?
The spirit that can hurt you the most is always your own, and it's the one you can't get rid of or hide from. I'm not going to tell you what to do or even what to believe, but I will ask you to have a good hard think about that.