This passage should be a sober warning for us. Amon was worshiping something far greater than himself, far more powerful than himself, and more glorious than himself. After all, that's the point of worship. He had found something that could quench his desires.
The problem, of course, is that just because it's supernatural doesn't mean it's good. And just because it's good doesn't mean you ought to worship it. In fact, the Bible is clear that you should only worship God, and that there is a distinction between creator and creation. The host of heaven (angels and demons) are created beings who you should not worship. They are powerful, persuasive, and--apart from context as beings less glorious than God--spectacular. If you were to see an angel at this moment, there would be a strong temptation to worship. Same goes with demons.
What? you think a demon would show up as a grotesque, ugly, vile creature? That would totally defeat the purpose. Demons (and their leader) are liars, deceivers, and con-artists. They don't create, they counterfeit. And for us to buy into the counterfeit, it has to be believable.

So, before you go off--like I did--and identify with the prophets (or worse yet, God) in the story, take a good long look at what you are worshiping. Are you believing a lie that money, fame, control, or power can satisfy you? If so, you (and I, if I'm honest) ought to identify with the villian in this story, Amon. He is in desperate need of a savior. And so are you and I. On the level of motive, my sin and his are remarkably similar. It's outright rebellion against God.

Lord, would you move in such a way as to show us our idols, that we might turn from them (again) and follow you!

2 Kings 21:3