Does anyone believe that many of the stories about pagan "gods" are true stories about demons that people mistakenly called "gods", and that many of the fantastic things that they talk about actually happened through the power of demons?

In Book Twenty one of the Iliad, Achilles is described in a battle with a river "god". Achilles was on a rampage, killing many Trojans and filling up the river Xanthus with their bodies and their blood. The "god" of the river was enraged because he sympathized with the Trojans, and when Achilles entered the river in pursuit of the fleeing Trojans,  this demon rose up against Achilles and tried to kill him. He brought the full flood of the river against him in an attempt to pull the hero under and drown him. He would have succeeded, but another demon, the fire "god" Hephaestus, came down and scorched the river with his flames until the river demon was forced to submit and let up the flood, allowing Achilles to live. Is this a description of a real battle between demons?

Did demons really fight with the people on either side of the Trojan War? When Homer describes a "god" giving power to a hero, was he describing the demon entering and possessing him, giving him great power? Were the great heroes like Achilles, Patroclus, Hector, and Aeneas really demoniacs? This would explain why a single hero through demonic fury could fight against an entire army as is described many times throughout the Illiad, because the demon with all of the demon's power and fury was in possession of the man. Homer describes this happening many times when Diomedes, Patroclus, Hector, others, most spectacularly Achilles, are given power from a "god" such as Athena or Apollo, and single-handedly destroy whole groups of soldiers. Similar events occur in other mythology, especially with heroes like Cú Chulainn, and of course, heroes like Samson do similar feats through the power of God and not a demon. Is "blood lust" a demon taking possession of the warrior and are berserkers an example of this?

At other times, certain "gods" would not take possession of the hero, but they would do other things to intervene in the battle, such as in the Odyssey, when Odysseus returns home and battles the suitors, Athena appears and fills the suitors with fear so that they will be more easily slaughtered.

Another example, if pagans sacrifice a virgin to a demon, perhaps a demon was given power over the volcano and this demon came to the pagans and blackmailed them into sacrificing the virgin. If they refused, the demon was actually given the power to make the volcano erupt. Maybe the sibyls of Apollo were given real knowledge from the demon Apollo and were not just speaking in riddles as the skeptics say. I would guess that when Christ died on the Cross, the demons power was greatly lessened, as some say that the sibyls lost their power of prophecy when Christ died on the Cross, but that these pagan religions were not just silly superstitions, but had real power over nature given from the demons. Maybe when the Ethiopians made all of those sacrifices to the demon Poseidon, he really did grant their sailors good winds and calm seas. And When Agamemnon sacrificed Iphigenia to the demon Artemis, the winds really did start blowing because the demon Artemis was given a real power over the winds and made them cease when she was offended so that the Greeks could not leave for Troy until her anger was satisfied.