The New Testament Has No Truth Content About Satan or Demons

The waltons say the new testament has no truth content about satan and demons. Where is this idea of satan being in the wilderness and having the ability to tempt does it come from? If not the old testamentand the waltons habitually don't even raise questions like this. They avoid them. It's perfectly in concert with god's programad. The weltons would say, no, your you're reading into it what we're supposed to learn. There nothing to learn.