Back in the early Bronze Age, Religious propaganda consisted of coming to your enemies' walls and yelling about how your God could totally kick their God's ass. Then the people inside the walls would get pissed off, fight back, there would be this whole siege thing, and they would find out which God had the biggest stick.

Until the Assyrians had this idea where they would come to someone's walls, and yell "hey, your God is super awesome, like, really cool, but you guys suck, you don't pray, don't do your religious duties and shit, so you let him down, and he sent us to subjugate you and put you back in the right path". Now suddenly you've got priests going " I told you so", and practically opening the gates for their invaders, and the population just going along with it, because yeah, I guess we've been kinda slacking off lately, point taken. For effect, they would even "kidnap" their gods (statues), and take them to their capital.

Where's the largest impact, you ask? One of those "disappointed" Gods' name was Yahweh. At the time, Gods were tribal things, each tribe had their own (or a few of them), and thay was it. But Yahweh commanded another nation to beat them up! So clearly Yahweh is not just this tribe's God, but a Universal God. And he's disappointed, and when he's disappointed he sends huge armies to beat you up. And the priests were right and the kings let the people down by being complacent. If you read the old testament/torah, this whole thing was completely internalized there, and by the time it happened again, this time with Babylon (who used the same style of propaganda), the priests in captivity concluded that he was not just a universal God, but the only God, that commanded all nations (but mostly to beat Israel up or rescue them depending on his current mood). The whole of Abrahamic monotheism, and most of the old testament's narrative after the Exodus, all derive in large part from some piece of Assyrian war propaganda.