I would easily say that in Golarion, every single good-aligned deity and church would absolutely balk at the idea of one of their clerics attempting to become a lich. Because you're not an arcane caster, most clerics attempt to become liches with the blessing of their deity, and you sure as hell wouldn't get any kind of blessing like that from Cayden. Not to mention the fact that even if you didn't get a blessing from your deity, the method of becoming a lich requires you to do horrifically evil acts. If your GM wants to rule that there are good liches in your setting that's fine, but undead-hood is not what a standard cleric of a good-aligned deity should be pursuing and you would absolutely fall and become an ex-cleric in the act. The same thing as if you attempted to repeatedly cast evil spells from a wand or scroll in an attempt to raise or create undead.
Also, to Bob Bob Bob, ever since the start of 3.0 undead creation and animation spells have been Evil with a capital E. I don't know where you're getting this idea that "Golarion fluff is influencing setting neutral books!!!!1!"