I am a Christian and believe that God does not want us to communicate with any being but Him. You have no idea what is on the other end of the interaction. This is why I don't like these shows. Fake or not they promote acknowledging spirits. There is evil out there. Doing this may open a door and invite trouble in. Why subject yourself to it unless absolutely necessary?
Also, I suggest that those of you who bash Christianity do some open-minded reading and see for yourselves what Christianity really is. If I am wrong then that's fine. No harm done. If I am right then I will spend eternity with Jesus without evil and sin.