Someone explained to me today that he believed that there were witches, etc. He said that he believed in God, so he believed these things, too. His exact words were: "If there's good, there's evil."
Turns out that I disagree with this statement. He is saying that if there is good, it necessarily follows that there is evil. If there is God, it necessarily follows that there are demons. That is SO not true. God is the only necessary being. He did not have to create anything or anyone. Demons do not exist of their own volition or power. Furthermore, the fact that they exist, and that evil exists, is due to a choice. The choice was theirs not to follow God. God did not require that demons existed. They only became demons when they chose to do so.
I think the other very dangerous place that this statement takes us is to allow us to believe that good and evil are two equal but opposite forces. Again, NOT true. It is true that evil is so much stronger than us that it's hard to fathom that it is so much smaller than God.
I do believe that demons are out there. I believe there is a hell, that there is great evil in the world. However, I also believe that it is much smaller than the good that is, because the good is God.