Perhaps. I do, however, think that a demon possessed person, is different from a Nephilim. A demon possessed person, can be delivered from his possession, a Nephilim cannot. They are hybrid creatures.
While I think both exist in the world today, and are definitely evil, I don’t think there is a demon possessed person or a Nephilim behind every tree. I believe they are here, but I also think there are just evil people everywhere, but not all are demon possessed, or hybrids (Nephilim)
The closer we get to the end, the more of these bizarre creatures we’ll start seeing come out of the shadows.