You are right, nbcrusader, God requires a monopoly.
However, God is in everything. He is in all of us, every moment.
My knowledge of God is that every existing spirit is made up by God. So with all respect, I think that this monopoly, while it is a monopoly, excludes nothing. How do I know this? The Holy Spirit taught me by touching my soul. If he is in me, if he is in the wind, if he is in the rivers and the nature, he shall also be in you.
As to the original question, I believe that you can get into contact with the spirits of the Dead by practising yourself.
If you have no clue about shamanism, it will not help you a lot to see a faith healer. You have to learn in order to be able to interprete what your teachers tell you. before of that, you have to select your teachers. Some know a lot, some know nothing. There are many ways.
Yes, there are dark forces. You better not fool with them.
However, if your mission is to heal, you have to know about them. That´s what I am trying to learn, step by step.
Again, back to the spirits of the Dead.. to illustrate an example: the night of the 31st of October, I did not attend a Halloween party. Instead, I celebrated Samhain. This is an old celebration by the Celtic folks. Their ancient knowledge says that this night is very good to make contact with the spirits. We burned a fire, reading poems of the ones we miss and wanted to greet, and there was nothing dark or forbidden about that. In fact, there were children with us, and I had the chance to pray with them. It was very beautiful to see their faces in the light of the candles.
It´s just very natural, like a meeting with friends. It´s just like a gathering in Church. The room and the surroundings don´t matter, spirit is everywhere and at all times. It depends on your powers, and on the will of the spirits to pass by.