that passage does NOT say we are not fighting against human beings. that interpretation is inferred.
there is only God, man and the angels. men run this world, not demons or nephilim, for which there is no evidence whatsoever (large buildings and relics imply there were once large humans, not that angels fell etc. etc.)
that's how deep the deep state is - they pretend that supernatural beings are in charge of their evil.
luckily, Jesus wins, rev 19 :-)