Not sure that would be possible since there is no "mark of Cain" for demons. The difference between angel and demon, if there was one, would be there. If God does not tell us, then how do we know? Does God say, we can tell a demon because....? If enmity is not accepted, and that is the weapon, what verse could counter what has been said ? Demon possession? That changed, it was a post Christ reduction. A few hundred years after Christ, it became obsolete. If A family agrees that the Bible is a fairy tale, what do they do when someone levitates off the bed, starts speaking in a dead language, and spits up pea soup? There is nothing ER can do, they turn to what was a fairy tale since nothing we know can make people do that. Before a group would create a god, now, that is not what they do. Someone really stumbles into something that draws them in, whether they realize it or not. Counter productive otherwise. Now, the tool of choice is ghosts. If the dead are sleep, and they do not know what the living are doing, then demons are at play. Who, or what is missing from the Eden story? Over seven billion people on the planet, and we all struggle in this chaos, how can Adam and Eve be expected to survive, if we struggle? All those demons, putting just two people in their cross hairs, and God is not putting something in the garden for them? God put faith that something would look after Adam and Eve, and He was betrayed. I think the serpent is a saraph myself, but bottom line remains leaving Adam and Eve alone with a world full of demons is hard to believe.