Given that the return of Jesus is near
As it has been for a couple of thousand years or so. He will return wh n it is His good pleasure, when no one expects Him.
Wasn't the planet dominated by demons prior to the flood?
Not that I've seen in Scripture. Got a chapter and verse on that?
We know that the Antichrist and fake Jesus (false prophet) are demons.
Once again, chapter and verse. What some people think is of no importance.
They will control the planet.
18 And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth.
19Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:
20Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway,
even unto the end of the world.
It makes sense that some of them are here now monitoring the planet. I suspect that even the Antichrist is here but hasn't been revealed yet.
People can find ways to believe that the veriest insanity "makes sense". What in fact does Scripture say? That's what's important.
Eschaological doctrines run across the spectrum from DC to daylight, from the strictly biblical to the ravings of lunatics. Where a fairy tale traditionally begins with "once upon a time", End Times fantasies generally begin with "what that really means is...". If you're taking someone's word about what's going to happen just before our Lord returns the odds are you're hearing what somebody hear from somebody who heard from somebody who likewise heard from somebody who read the Revelation, grossly misunderstood it, made up stuff to fill in the gaps, and persuaded the next goob that his baseless notions were direct from God. Garbage in, garbage out. passed around amongst the credulous ad infinitum.
Read the Gospels. Then read them again. And again. Then read the Revelation, and read it with the Gospels are your baseline for understanding. Forget the sensationlist stuff you've read by people who have their own bills of goods to sell you. The Gospel is the key. If anyone tells you something that doesn't sort with the Gospel, reject it out of hand. That's where you start.