Biblically speaking, spirits from the vasty deep must be demons since they are from below and angels, God and Jesus are from above. So in that sense it’s not very impressive. Demons are something a sane person would rather avoid.
Crazy how much the quote went over your head. Literature written for peasants 400 years ago and you can't grasp the point
I mean, if you want to inject religion into this, that interpretation that it "must be demons" isn't even supported by the source text.
In 1 Samuel, King Saul visits a medium in Endor in order to speak to the (dead) prophet Samuel. Human dead go to Shoel (in familiar terms, it is similar to the Greek underworld) in the Old Testament. Later on in the New Testament, the idea of a really really bad place is introduced in the form of Tartarus, which is specifically where the rebelling angels were sent. But that is not the same place human dead go.
The idea that everything "not Heaven" must be Hell is an invention, caused mostly by dogma that rose from bad translations of the Greek and Hebrew in the middle ages (for example, King James - itself mostly correcting minor errors of the older Bishop's Bible - refers to all of it as Hell even though the original text most inarguably refers to different places different beings go).