You think the saved are beyond Satan’s wrath, here on earth? You should chat with an exorcist.
Your soul is OK, but your body may not be.
Here’s one description of the toll some exorcists take:
“It’s like being naked, and bound, and having a massive, snarling, hungry wolf sniffing at your body.” (Hostage to the Devil - Malachi Martin - Harper Smithsonian Press)
I think some of the prophets had to deal with this too, the palpable presence of demons. Demons they could see.
The battle between God and Lucifer is kinetic. The battle is for mankind. I’m fine, I’m saved. It doesn’t mean I’m immune from the actions of evil - a member of some protected class on earth.
Satan cannot win against the Holy Spirit. Satan and the HS cannot both be in the same body. Any possessed people are not saved people.