There's two things I like to keep in mind when folks tell me I'm inviting demons by playing with tarot...
1. The people who tell you these things are generally close-minded, afraid of the unknown, and heck, they're rude! I don't know anyone who would not be affronted or offended by being told that they're going to hell because of [insert practice here]. I managed to stay friends with the one person who told me this the most; she's a brilliantly intelligent and talented woman, but she was brought up in a closeted Christian family whose opinions of non-Christians were based 100% on hate. After she distanced herself from her family a little and looked at her life with an outsider's eye, she quickly matured and recently told me she accepted not only my tarot practices but my bisexuality as well. She was taught to react with fear and hatred.
2. This one is important. Look at your tarot deck, and what do you see? Some people see a portal to hell just waiting to open at the first shuffle. You know what I see? 78 pieces of cardboard that can be used for psychological insight and fortune telling. Nothing demonic about that! Sure, tarot can be scary sometimes. Sometimes we get answers we would rather not admit were true, and sometimes we predict sad things, but I believe that unless you are absolutely, one hundred and ten percent focused on summoning demons with your tarot deck (if demons even exist), then your tarot deck is NOT going to turn into a hell portal. Its all in your intention. People who pity themselves will get depressing results, just as much as people who intend to summon demons will probably get "demonic" results, whether its all in their mind or not.
There is nothing wrong with you! Nothing effecting your mind that's "forcing" you to use tarot, and you certainly don't need to be cleansed by a church. Tarot can be anything from an amusing tool to an object of lifelong study, but it is NOT from the devil. I learned the hard way that you can't surround yourself with people who don't accept your beliefs and practices -- they'll only cause you pain and teach you to be afraid of everything you can't explain. If YOU love tarot, that's the only thing that matters.