I am Christian and do believe that there are demons and Satan.
and YES... They scare me. I have an area at the end of my street that has portals, and I think my neighborhood is haunted anyways, I felt a dark presence behind me. Before I said anything, a friend of mine who sees spirit, said there was something behind me. As soon as I vizualized white light, she said it walked away. Then soon after I opened up, I heard in a very dark voice "I'm gonna get you." It wasn't loud, but dark. The way I know if it's demonic or very angry I get extreme chills and my eyes water. Scary stuff. Usually demonic sounds very dark, or feels very dark. I came across a female demon (Or at least it took that form..) named Debra, as she told me, anyWays she had a normal voice but I saw her in my mind, and she had long black hair, wore all black, and had giant claws but had a normal voice, but felt demonic.