I think it's more about creating a creepy and mysterious atmosphere rather than being truly demonic. It plays with elements of horror and the supernatural to keep viewers on the edge of their seats.
American Horror Story isn't strictly demonic. It uses horror tropes and elements of the unknown to tell compelling stories. The 'demonic' aspect is often symbolic of the evil within people or the fears that haunt us.
Well, it depends on how you define 'demonic'. The show definitely has dark and sinister themes, but it's more about exploring human fears and twisted minds than literal demons.