Many of my friends had some sort of supernatural experience, some of them being disturbed by unseen spirit for many years until they found their Guru to help them to stop the disturbance.
I agree with Mana, human is so precious to practice Dharma. We always hold on to permanent and attach to what we thought will be good for us. There are many spirits attached to their house, their properties when they were alive, maybe for 50 to 60 years, but because of their attachment, they became a spirit of that area for thousands and thousands of years.
On top of that, If spirit exist, for sure Tara, Manjushri, Tsongkhapa, Dorje Shugden exist, then enlightenment is possible too.