while i believe in spirits, i also believe 95% of what you see on a ghost hunting or other supernatural show is falsified for ratings. i have watched several ghost hunter shows [don't remember the names of any of them] there is one i actually liked because they may record a noise, but then they try and disprove the noise as something logical, and i liked that because all the other shows if a branch would brush against a window they will overreact like crazy.
unfortunately you will always have the non-believers unless you can get a spirit to fully manifest, shake the persons hand and say 'hi, there is life after death' then vanish. even then you may have your nay sayers. it's better to focus on your own beliefs and strengthen your views.