How do you know this is a "Christian" haunted house?
Our God doesn't haunt houses, nor does he send angels to haunt houses. No one can be won over by showing them BAD things. There are enough Bad things going on in this world as it is and it is not of God. Our God is a God of love, mercy,grace, and yes, he is also a God of judgement, but that judgement comes at a later time when the whole world will be judged. Our sins have their own penalties or rather, disciplinary action. What is it that makes you think that a haunted house is a consequence of someones mistakes from God? No Way!!
Have you ever heard the saying that "you can catch more bees with honey than you can with vinegar"? It works the same here. People are tired of hearing about the "fires of Hell". this is a time, especially now, when love works wonders. Try it and see.