So, my group has recently started running the curse of the crimson throne ap, and I decided to play a paladin. After a few sessions, I got bad marks as a paladin for killing an ettercap, as it was a sentient being.(when I found it, it was chewing on a corpse, I might resent the GM a little for this) If I do fall, that's unfortunate but oh well. Anyways I was just hoping for advice to try to avoid falling if at all possible.
Im sorry to say that, but from your example i must say:" your gm is a fool"
Iomedae is THE paladin in Golarion and im sure she would absolutely slaughter that ettercap. My advice? Play another character. In this campaign are really hard decisions for your paladin, but if THAT was problematic allrdy? Just stop play this character.