I would rule that there is a barrier in Krynn that blocks the power from outside gods, but that it only really works on demigods. True gods can bypass it. So Andoletta's clerics would slowly lose their power, while the clerics of Sarenrae would be unaffected.
Magic in Krynn comes from the moons. This should be reflected by some feat that would allow Krynn mages to increase their power based on the moons. This would make them stronger on Krynn, but weaker on Golarion.
The Towers of High Sorcery would also try to regulate and control the magic users coming from Golarion. The Golarion mages would look at them as a bunch of extorstionists or self gloryfing loons at first. The idea that one organisation claiming to represent ant contain all arcane magic-users would be a ridiculeus boast to them. So the Golarion mages would ignore them, wich would make the Towers pressure harder and things would escalate from there.
The Balance between Good and Evil. This is a key component in the Dragonlance. Golarion lack that and the idea that Good not being opposed by Evil would cause it to become Evil, would look bizarre, bordering on Blue and Orange Morality to the people and gods of Golarion. Cayden would then promptly ignore the Krynn gods and proceed to drink wine and try to beat up Evil.
About 7: You should check out the anime/webnovel Overlord. The main character, an average man, becomes a lich and he realises that he is no longer distrubed by death and murder and that he has no emphathy for humans anymore. Creepy sets in the moment he freaks out over this and his undead state forcibly calms him down. Now imagine hundreds of years of such an existence.
The god of Magic. Followers keep to a personal code, but have no problems breaking laws to save lives. Often depicted wearing a long coat while burning down evil-doers.
Lord Fyre wrote:
In that situation I think the Shelynite would call him The Brother of Our Beloved Lady. True, and not something the Kuthite can take offense to.