The Osirians, watching the balloons, collectively draw all of the following conclusions:
Evangelism for Cayden Cailean and all chaotic gods should definitely continue to be banned in Osirion, and probably the government should go much further. Snack Service should definitely be banned. Anything it writes should probably also be banned.
Cake girl is a victim.
Premarital sex is definitely the road to all manner of existential horrors.
Also, sending women to school is a horrible, awful mistake.
The most outrageous and exaggerated stories of the sexual degeneracy and awfulness of Avistan appear to just be straightforwardly completely true.
It is better for everyone in Osirion to die than to become like Avistan in any way.
Between the two characterizations of Cheliax that people outside Cheliax argue about, the one where the people of Cheliax are fundamentally deceived by Asmodeus/tricked through soul-selling and so on to go to Hell despite being basically normal people, and the one where Asmodeus manages to successfully make everyone into Cheliax into such horrible people they deserve to go to Hell, it's definitely the second one.
The world Keltham came from before this must, aside from its superior knowledge of alchemy, be an utterly horrifying place for Cheliax to have been able to pull off the harem play.
Cayden Cailean has either ceased to have any qualities whatsoever besides inane silliness, or really desperately wants Cheliax to believe that and is willing to make horrifying expenditures of resources to make it look like He has nothing going on besides inane silliness.
The new cleric of Abadar is clearly in the middle of a profound and horrifying breakdown and should probably spend several months in a monastery in the mountains, desperate as everyone is to speak with him.
Also, Snack Service's illusions are really compelling - the balloons don't appear illusory. Which raises the question of whether literally everything that has happened since they arrived in Cheliax has been an elaborate deception meant to persuade them of one or more of the above things.